157996905 has 16 divisors (see below), whose sum is σ = 275776704. Its totient is φ = 76604480.

The previous prime is 157996871. The next prime is 157996907. The reversal of 157996905 is 509699751.

It is a happy number.

It is not a de Polignac number, because 157996905 - 2⁷ = 157996777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157996907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 478614 + ... + 478943.

It is an arithmetic number, because the mean of its divisors is an integer number (17236044).

Almost surely, 2^157996905 is an apocalyptic number.

157996905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

157996905 is a deficient number, since it is larger than the sum of its proper divisors (117779799).

157996905 is a wasteful number, since it uses less digits than its factorization.

157996905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957576.

The product of its (nonzero) digits is 765450, while the sum is 51.

The square root of 157996905 is about 12569.6819768839. The cubic root of 157996905 is about 540.6084876064.

The spelling of 157996905 in words is "one hundred fifty-seven million, nine hundred ninety-six thousand, nine hundred five".