390113281 has 4 divisors (see below), whose sum is σ = 407074752. Its totient is φ = 373151812.

The previous prime is 390113261. The next prime is 390113287. The reversal of 390113281 is 182311093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 182311093 = 31 ⋅5881003.

It is a cyclic number.

It is not a de Polignac number, because 390113281 - 2¹⁵ = 390080513 is a prime.

It is a super-2 number, since 2×390113281² = 304376744025169922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390113287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8480701 + ... + 8480746.

It is an arithmetic number, because the mean of its divisors is an integer number (101768688).

Almost surely, 2^390113281 is an apocalyptic number.

It is an amenable number.

390113281 is a deficient number, since it is larger than the sum of its proper divisors (16961471).

390113281 is a wasteful number, since it uses less digits than its factorization.

390113281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16961470.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 390113281 is about 19751.2855530976. The cubic root of 390113281 is about 730.6850896395.

The spelling of 390113281 in words is "three hundred ninety million, one hundred thirteen thousand, two hundred eighty-one".