157809442 has 8 divisors (see below), whose sum is σ = 270530496. Its totient is φ = 67632612.

The previous prime is 157809439. The next prime is 157809469. The reversal of 157809442 is 244908751.

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

It is a junction number, because it is equal to n+sod(n) for n = 157809395 and 157809404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5636038 + ... + 5636065.

It is an arithmetic number, because the mean of its divisors is an integer number (33816312).

Almost surely, 2^157809442 is an apocalyptic number.

157809442 is a deficient number, since it is larger than the sum of its proper divisors (112721054).

157809442 is a wasteful number, since it uses less digits than its factorization.

157809442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11272112.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 157809442 is about 12562.2228128624. Note that the first 3 decimals coincide. The cubic root of 157809442 is about 540.3945927058.

The spelling of 157809442 in words is "one hundred fifty-seven million, eight hundred nine thousand, four hundred forty-two".