390166840 has 32 divisors (see below), whose sum is σ = 1003286880. Its totient is φ = 133771392.

The previous prime is 390166831. The next prime is 390166849. The reversal of 390166840 is 48661093.

It is an interprime number because it is at equal distance from previous prime (390166831) and next prime (390166849).

It is a self number, because there is not a number n which added to its sum of digits gives 390166840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390166849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696447 + ... + 697006.

It is an arithmetic number, because the mean of its divisors is an integer number (31352715).

Almost surely, 2^390166840 is an apocalyptic number.

It is an amenable number.

390166840 is an abundant number, since it is smaller than the sum of its proper divisors (613120040).

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

390166840 is a wasteful number, since it uses less digits than its factorization.

390166840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393471 (or 1393467 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 390166840 is about 19752.6413423623. The cubic root of 390166840 is about 730.7185269118.

The spelling of 390166840 in words is "three hundred ninety million, one hundred sixty-six thousand, eight hundred forty".