157809903 has 8 divisors (see below), whose sum is σ = 210854400. Its totient is φ = 104986008.

The previous prime is 157809893. The next prime is 157809907. The reversal of 157809903 is 309908751.

It is a happy number.

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

It is not a de Polignac number, because 157809903 - 2⁴ = 157809887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157809907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53473 + ... + 56346.

It is an arithmetic number, because the mean of its divisors is an integer number (26356800).

Almost surely, 2^157809903 is an apocalyptic number.

157809903 is a deficient number, since it is larger than the sum of its proper divisors (53044497).

157809903 is a wasteful number, since it uses less digits than its factorization.

157809903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110301.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 157809903 is about 12562.2411615125. The cubic root of 157809903 is about 540.3951189136.

The spelling of 157809903 in words is "one hundred fifty-seven million, eight hundred nine thousand, nine hundred three".