390374881 has 4 divisors (see below), whose sum is σ = 420403732. Its totient is φ = 360346032.

The previous prime is 390374879. The next prime is 390374911. The reversal of 390374881 is 188473093.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46457856 + 343917025 = 6816^2 + 18545^2 .

It is a cyclic number.

It is not a de Polignac number, because 390374881 - 2¹ = 390374879 is a prime.

It is a super-2 number, since 2×390374881² = 304785095431528322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390374801) 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, 15014406 + ... + 15014431.

It is an arithmetic number, because the mean of its divisors is an integer number (105100933).

Almost surely, 2^390374881 is an apocalyptic number.

It is an amenable number.

390374881 is a deficient number, since it is larger than the sum of its proper divisors (30028851).

390374881 is a wasteful number, since it uses less digits than its factorization.

390374881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30028850.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 390374881 is about 19757.9067970269. The cubic root of 390374881 is about 730.8483793971.

The spelling of 390374881 in words is "three hundred ninety million, three hundred seventy-four thousand, eight hundred eighty-one".