157221800 has 24 divisors (see below), whose sum is σ = 365541150. Its totient is φ = 62888640.

The previous prime is 157221787. The next prime is 157221817. The reversal of 157221800 is 8122751.

It can be written as a sum of positive squares in 3 ways, for example, as 62315236 + 94906564 = 7894^2 + 9742^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 157221800.

It is an unprimeable number.

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, 392855 + ... + 393254.

Almost surely, 2^157221800 is an apocalyptic number.

157221800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157221800 is an abundant number, since it is smaller than the sum of its proper divisors (208319350).

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

157221800 is a wasteful number, since it uses less digits than its factorization.

157221800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786125 (or 786116 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 157221800 is about 12538.8117459351. The cubic root of 157221800 is about 539.7229946450.

The spelling of 157221800 in words is "one hundred fifty-seven million, two hundred twenty-one thousand, eight hundred".