157155442 has 4 divisors (see below), whose sum is σ = 235733166. Its totient is φ = 78577720.

The previous prime is 157155431. The next prime is 157155503. The reversal of 157155442 is 244551751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244551751 = 29 ⋅8432819.

It can be written as a sum of positive squares in only one way, i.e., 80084601 + 77070841 = 8949^2 + 8779^2 .

It is a junction number, because it is equal to n+sod(n) for n = 157155398 and 157155407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39288859 + ... + 39288862.

Almost surely, 2^157155442 is an apocalyptic number.

157155442 is a deficient number, since it is larger than the sum of its proper divisors (78577724).

157155442 is an equidigital number, since it uses as much as digits as its factorization.

157155442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78577723.

The product of its digits is 28000, while the sum is 34.

The square root of 157155442 is about 12536.1653626617. The cubic root of 157155442 is about 539.6470510239.

The spelling of 157155442 in words is "one hundred fifty-seven million, one hundred fifty-five thousand, four hundred forty-two".