390072538 has 4 divisors (see below), whose sum is σ = 585108810. Its totient is φ = 195036268.

The previous prime is 390072521. The next prime is 390072539. The reversal of 390072538 is 835270093.

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., 386397649 + 3674889 = 19657^2 + 1917^2 .

It is a super-2 number, since 2×390072538² = 304313169803522888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 390072497 and 390072506.

It is not an unprimeable number, because it can be changed into a prime (390072539) by changing a digit.

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, 97518133 + ... + 97518136.

Almost surely, 2^390072538 is an apocalyptic number.

390072538 is a deficient number, since it is larger than the sum of its proper divisors (195036272).

390072538 is a wasteful number, since it uses less digits than its factorization.

390072538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195036271.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 390072538 is about 19750.2541249474. The cubic root of 390072538 is about 730.6596514395.

The spelling of 390072538 in words is "three hundred ninety million, seventy-two thousand, five hundred thirty-eight".