390416989 has 4 divisors (see below), whose sum is σ = 390477340. Its totient is φ = 390356640.

The previous prime is 390416981. The next prime is 390417011. The reversal of 390416989 is 989614093.

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 377991364 + 12425625 = 19442^2 + 3525^2 .

It is a cyclic number.

It is not a de Polignac number, because 390416989 - 2³ = 390416981 is a prime.

It is a super-2 number, since 2×390416989² = 304850850599652242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390416981) 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, 19122 + ... + 33859.

It is an arithmetic number, because the mean of its divisors is an integer number (97619335).

Almost surely, 2^390416989 is an apocalyptic number.

It is an amenable number.

390416989 is a deficient number, since it is larger than the sum of its proper divisors (60351).

390416989 is an equidigital number, since it uses as much as digits as its factorization.

390416989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60350.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 390416989 is about 19758.9723670033. The cubic root of 390416989 is about 730.8746562390.

The spelling of 390416989 in words is "three hundred ninety million, four hundred sixteen thousand, nine hundred eighty-nine".