390440569 has 4 divisors (see below), whose sum is σ = 390481920. Its totient is φ = 390399220.

The previous prime is 390440551. The next prime is 390440593. The reversal of 390440569 is 965044093.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 965044093 = 13 ⋅74234161.

It is a cyclic number.

It is not a de Polignac number, because 390440569 - 2²³ = 382051961 is a prime.

It is a super-2 number, since 2×390440569² = 304887675842087522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390240569) 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, 1212 + ... + 27970.

It is an arithmetic number, because the mean of its divisors is an integer number (97620480).

Almost surely, 2^390440569 is an apocalyptic number.

It is an amenable number.

390440569 is a deficient number, since it is larger than the sum of its proper divisors (41351).

390440569 is a wasteful number, since it uses less digits than its factorization.

390440569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41350.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 390440569 is about 19759.5690489444. The cubic root of 390440569 is about 730.8893701457.

The spelling of 390440569 in words is "three hundred ninety million, four hundred forty thousand, five hundred sixty-nine".