390400369 has 4 divisors (see below), whose sum is σ = 394786980. Its totient is φ = 386013760.

The previous prime is 390400337. The next prime is 390400379. The reversal of 390400369 is 963004093.

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 102758769 + 287641600 = 10137^2 + 16960^2 .

It is a cyclic number.

It is not a de Polignac number, because 390400369 - 2⁵ = 390400337 is a prime.

It is a super-2 number, since 2×390400369² = 304824896230672322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390400379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2193172 + ... + 2193349.

It is an arithmetic number, because the mean of its divisors is an integer number (98696745).

Almost surely, 2^390400369 is an apocalyptic number.

It is an amenable number.

390400369 is a deficient number, since it is larger than the sum of its proper divisors (4386611).

390400369 is an equidigital number, since it uses as much as digits as its factorization.

390400369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4386610.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 390400369 is about 19758.5517940967. The cubic root of 390400369 is about 730.8642850124.

The spelling of 390400369 in words is "three hundred ninety million, four hundred thousand, three hundred sixty-nine".