390053556 has 60 divisors (see below), whose sum is σ = 1047268068. Its totient is φ = 126499968.

The previous prime is 390053551. The next prime is 390053561. The reversal of 390053556 is 655350093.

It is an interprime number because it is at equal distance from previous prime (390053551) and next prime (390053561).

It can be written as a sum of positive squares in 2 ways, for example, as 141991056 + 248062500 = 11916^2 + 15750^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 390053556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390053551) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4281 + ... + 28256.

Almost surely, 2^390053556 is an apocalyptic number.

390053556 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

390053556 is an abundant number, since it is smaller than the sum of its proper divisors (657214512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390053556 is a wasteful number, since it uses less digits than its factorization.

390053556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32590 (or 32579 counting only the distinct ones).

The product of its (nonzero) digits is 60750, while the sum is 36.

The square root of 390053556 is about 19749.7735683222. The cubic root of 390053556 is about 730.6477992794.

The spelling of 390053556 in words is "three hundred ninety million, fifty-three thousand, five hundred fifty-six".