157821432 has 16 divisors (see below), whose sum is σ = 394553640. Its totient is φ = 52607136.

The previous prime is 157821431. The next prime is 157821463. The reversal of 157821432 is 234128751.

It is a junction number, because it is equal to n+sod(n) for n = 157821393 and 157821402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821431) 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 3 ways as a sum of consecutive naturals, for example, 3287923 + ... + 3287970.

Almost surely, 2^157821432 is an apocalyptic number.

157821432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

157821432 is an abundant number, since it is smaller than the sum of its proper divisors (236732208).

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

157821432 is a wasteful number, since it uses less digits than its factorization.

157821432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6575902 (or 6575898 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 157821432 is about 12562.7000282583. The cubic root of 157821432 is about 540.4082783404.

The spelling of 157821432 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, four hundred thirty-two".