157457242 has 4 divisors (see below), whose sum is σ = 236185866. Its totient is φ = 78728620.

The previous prime is 157457239. The next prime is 157457243. The reversal of 157457242 is 242754751.

157457242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 144504441 + 12952801 = 12021^2 + 3599^2 .

It is not an unprimeable number, because it can be changed into a prime (157457243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39364309 + ... + 39364312.

Almost surely, 2^157457242 is an apocalyptic number.

157457242 is a deficient number, since it is larger than the sum of its proper divisors (78728624).

157457242 is an equidigital number, since it uses as much as digits as its factorization.

157457242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78728623.

The product of its digits is 78400, while the sum is 37.

The square root of 157457242 is about 12548.1967628819. The cubic root of 157457242 is about 539.9922746952.

The spelling of 157457242 in words is "one hundred fifty-seven million, four hundred fifty-seven thousand, two hundred forty-two".