157907705 has 4 divisors (see below), whose sum is σ = 189489252. Its totient is φ = 126326160.

The previous prime is 157907699. The next prime is 157907731. The reversal of 157907705 is 507709751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507709751 = 23 ⋅22074337.

It can be written as a sum of positive squares in 2 ways, for example, as 86471401 + 71436304 = 9299^2 + 8452^2 .

It is not a de Polignac number, because 157907705 - 2¹⁰ = 157906681 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15790766 + ... + 15790775.

It is an arithmetic number, because the mean of its divisors is an integer number (47372313).

Almost surely, 2^157907705 is an apocalyptic number.

It is an amenable number.

157907705 is a deficient number, since it is larger than the sum of its proper divisors (31581547).

157907705 is an equidigital number, since it uses as much as digits as its factorization.

157907705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31581546.

The product of its (nonzero) digits is 77175, while the sum is 41.

The square root of 157907705 is about 12566.1332556996. The cubic root of 157907705 is about 540.5067317000.

The spelling of 157907705 in words is "one hundred fifty-seven million, nine hundred seven thousand, seven hundred five".