156120442 has 4 divisors (see below), whose sum is σ = 234180666. Its totient is φ = 78060220.

The previous prime is 156120413. The next prime is 156120449. The reversal of 156120442 is 244021651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244021651 = 23 ⋅10609637.

It can be written as a sum of positive squares in only one way, i.e., 146627881 + 9492561 = 12109^2 + 3081^2 .

It is not an unprimeable number, because it can be changed into a prime (156120449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39030109 + ... + 39030112.

Almost surely, 2^156120442 is an apocalyptic number.

156120442 is a deficient number, since it is larger than the sum of its proper divisors (78060224).

156120442 is an equidigital number, since it uses as much as digits as its factorization.

156120442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78060223.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 156120442 is about 12494.8166052968. The cubic root of 156120442 is about 538.4597650774.

The spelling of 156120442 in words is "one hundred fifty-six million, one hundred twenty thousand, four hundred forty-two".