157127242 has 4 divisors (see below), whose sum is σ = 235690866. Its totient is φ = 78563620.

The previous prime is 157127219. The next prime is 157127263. The reversal of 157127242 is 242721751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242721751 = 19 ⋅12774829.

It can be written as a sum of positive squares in only one way, i.e., 148133241 + 8994001 = 12171^2 + 2999^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39281809 + ... + 39281812.

Almost surely, 2^157127242 is an apocalyptic number.

157127242 is a deficient number, since it is larger than the sum of its proper divisors (78563624).

157127242 is an equidigital number, since it uses as much as digits as its factorization.

157127242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78563623.

The product of its digits is 7840, while the sum is 31.

The square root of 157127242 is about 12535.0405663484. The cubic root of 157127242 is about 539.6147709727.

Adding to 157127242 its reverse (242721751), we get a palindrome (399848993).

The spelling of 157127242 in words is "one hundred fifty-seven million, one hundred twenty-seven thousand, two hundred forty-two".