157221198 has 12 divisors (see below), whose sum is σ = 340645968. Its totient is φ = 52407060.

The previous prime is 157221191. The next prime is 157221203. The reversal of 157221198 is 891122751.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157221191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4367238 + ... + 4367273.

It is an arithmetic number, because the mean of its divisors is an integer number (28387164).

Almost surely, 2^157221198 is an apocalyptic number.

157221198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

157221198 is an abundant number, since it is smaller than the sum of its proper divisors (183424770).

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

157221198 is a wasteful number, since it uses less digits than its factorization.

157221198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8734519 (or 8734516 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 157221198 is about 12538.7877404476. The cubic root of 157221198 is about 539.7223057803.

The spelling of 157221198 in words is "one hundred fifty-seven million, two hundred twenty-one thousand, one hundred ninety-eight".