139321620 has 144 divisors (see below), whose sum is σ = 443963520. Its totient is φ = 36671616.

The previous prime is 139321619. The next prime is 139321639. The reversal of 139321620 is 26123931.

139321620 is a `hidden beast` number, since 1 + 3 + 9 + 32 + 1 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 529609 + ... + 529871.

It is an arithmetic number, because the mean of its divisors is an integer number (3083080).

Almost surely, 2^139321620 is an apocalyptic number.

139321620 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 139321620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221981760).

139321620 is an abundant number, since it is smaller than the sum of its proper divisors (304641900).

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

139321620 is a wasteful number, since it uses less digits than its factorization.

139321620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 139321620 is about 11803.4579679008. The cubic root of 139321620 is about 518.4093651857.

The spelling of 139321620 in words is "one hundred thirty-nine million, three hundred twenty-one thousand, six hundred twenty".