157640442 has 8 divisors (see below), whose sum is σ = 315280896. Its totient is φ = 52546812.

The previous prime is 157640407. The next prime is 157640443. The reversal of 157640442 is 244046751.

It is a sphenic number, since it is the product of 3 distinct primes.

157640442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (157640443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13136698 + ... + 13136709.

It is an arithmetic number, because the mean of its divisors is an integer number (39410112).

Almost surely, 2^157640442 is an apocalyptic number.

157640442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

157640442 is a wasteful number, since it uses less digits than its factorization.

157640442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26273412.

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 157640442 is about 12555.4944944435. The cubic root of 157640442 is about 540.2016188141.

The spelling of 157640442 in words is "one hundred fifty-seven million, six hundred forty thousand, four hundred forty-two".