390287640 has 32 divisors (see below), whose sum is σ = 1170863280. Its totient is φ = 104076672.

The previous prime is 390287617. The next prime is 390287641. The reversal of 390287640 is 46782093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390287641) 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, 1626079 + ... + 1626318.

Almost surely, 2^390287640 is an apocalyptic number.

390287640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

390287640 is an abundant number, since it is smaller than the sum of its proper divisors (780575640).

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

390287640 is a wasteful number, since it uses less digits than its factorization.

390287640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252411 (or 3252407 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 390287640 is about 19755.6989246141. The cubic root of 390287640 is about 730.7939319955.

The spelling of 390287640 in words is "three hundred ninety million, two hundred eighty-seven thousand, six hundred forty".