156240394 has 4 divisors (see below), whose sum is σ = 234360594. Its totient is φ = 78120196.

The previous prime is 156240389. The next prime is 156240397. The reversal of 156240394 is 493042651.

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: 493042651 = 23 ⋅21436637.

It can be written as a sum of positive squares in only one way, i.e., 92448225 + 63792169 = 9615^2 + 7987^2 .

It is a super-2 number, since 2×156240394² = 48822121434550472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156240397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39060097 + ... + 39060100.

Almost surely, 2^156240394 is an apocalyptic number.

156240394 is a deficient number, since it is larger than the sum of its proper divisors (78120200).

156240394 is an equidigital number, since it uses as much as digits as its factorization.

156240394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78120199.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 156240394 is about 12499.6157540942. The cubic root of 156240394 is about 538.5976346820.

The spelling of 156240394 in words is "one hundred fifty-six million, two hundred forty thousand, three hundred ninety-four".