390544489 has 4 divisors (see below), whose sum is σ = 390691156. Its totient is φ = 390397824.

The previous prime is 390544457. The next prime is 390544499. The reversal of 390544489 is 984445093.

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 202635225 + 187909264 = 14235^2 + 13708^2 .

It is a cyclic number.

It is not a de Polignac number, because 390544489 - 2⁵ = 390544457 is a prime.

It is a super-2 number, since 2×390544489² = 305049995776542242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390544409) 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, 69264 + ... + 74689.

It is an arithmetic number, because the mean of its divisors is an integer number (97672789).

Almost surely, 2^390544489 is an apocalyptic number.

It is an amenable number.

390544489 is a deficient number, since it is larger than the sum of its proper divisors (146667).

390544489 is a wasteful number, since it uses less digits than its factorization.

390544489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146666.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 390544489 is about 19762.1984859985. The cubic root of 390544489 is about 730.9542091094.

The spelling of 390544489 in words is "three hundred ninety million, five hundred forty-four thousand, four hundred eighty-nine".