390044989 has 4 divisors (see below), whose sum is σ = 395866624. Its totient is φ = 384223356.

The previous prime is 390044969. The next prime is 390045011. The reversal of 390044989 is 989440093.

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.

It is a cyclic number.

It is not a de Polignac number, because 390044989 - 2¹¹ = 390042941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390044909) 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, 2910717 + ... + 2910850.

It is an arithmetic number, because the mean of its divisors is an integer number (98966656).

Almost surely, 2^390044989 is an apocalyptic number.

It is an amenable number.

390044989 is a deficient number, since it is larger than the sum of its proper divisors (5821635).

390044989 is an equidigital number, since it uses as much as digits as its factorization.

390044989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5821634.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 390044989 is about 19749.5566785688. The cubic root of 390044989 is about 730.6424500093.

The spelling of 390044989 in words is "three hundred ninety million, forty-four thousand, nine hundred eighty-nine".