196921620 has 144 divisors (see below), whose sum is σ = 686125440. Its totient is φ = 44782848.

The previous prime is 196921583. The next prime is 196921649. The reversal of 196921620 is 26129691.

196921620 is a `hidden beast` number, since 1 + 9 + 6 + 9 + 21 + 620 = 666.

196921620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 469771 + ... + 470189.

It is an arithmetic number, because the mean of its divisors is an integer number (4764760).

Almost surely, 2^196921620 is an apocalyptic number.

196921620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 196921620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343062720).

196921620 is an abundant number, since it is smaller than the sum of its proper divisors (489203820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

196921620 is a wasteful number, since it uses less digits than its factorization.

196921620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 196921620 is about 14032.8763979449. The cubic root of 196921620 is about 581.7876080495.

It can be divided in two parts, 19692 and 1620, that added together give a palindrome (21312).

The spelling of 196921620 in words is "one hundred ninety-six million, nine hundred twenty-one thousand, six hundred twenty".