157787929 has 4 divisors (see below), whose sum is σ = 169925476. Its totient is φ = 145650384.

The previous prime is 157787921. The next prime is 157787939. The reversal of 157787929 is 929787751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 929787751 = 8461 ⋅109891.

It can be written as a sum of positive squares in 2 ways, for example, as 19184400 + 138603529 = 4380^2 + 11773^2 .

It is a cyclic number.

It is not a de Polignac number, because 157787929 - 2³ = 157787921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157787929.

It is not an unprimeable number, because it can be changed into a prime (157787921) 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, 6068754 + ... + 6068779.

It is an arithmetic number, because the mean of its divisors is an integer number (42481369).

Almost surely, 2^157787929 is an apocalyptic number.

It is an amenable number.

157787929 is a deficient number, since it is larger than the sum of its proper divisors (12137547).

157787929 is a wasteful number, since it uses less digits than its factorization.

157787929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12137546.

The product of its digits is 2222640, while the sum is 55.

The square root of 157787929 is about 12561.3665259796. The cubic root of 157787929 is about 540.3700355838.

The spelling of 157787929 in words is "one hundred fifty-seven million, seven hundred eighty-seven thousand, nine hundred twenty-nine".