390840330 has 32 divisors (see below), whose sum is σ = 959834304. Its totient is φ = 101799936.

The previous prime is 390840323. The next prime is 390840349. The reversal of 390840330 is 33048093.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150199 + ... + 152778.

It is an arithmetic number, because the mean of its divisors is an integer number (29994822).

Almost surely, 2^390840330 is an apocalyptic number.

390840330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

390840330 is an abundant number, since it is smaller than the sum of its proper divisors (568993974).

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

390840330 is a wasteful number, since it uses less digits than its factorization.

390840330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303030.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 390840330 is about 19769.6820915259. The cubic root of 390840330 is about 731.1387306773.

It can be divided in two parts, 390840 and 330, that added together give a triangular number (391170 = T₈₈₄).

The spelling of 390840330 in words is "three hundred ninety million, eight hundred forty thousand, three hundred thirty".