390506994 has 80 divisors (see below), whose sum is σ = 911042880. Its totient is φ = 124921440.

The previous prime is 390506971. The next prime is 390506999. The reversal of 390506994 is 499605093.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (390506999) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 424467 + ... + 425385.

It is an arithmetic number, because the mean of its divisors is an integer number (11388036).

Almost surely, 2^390506994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390506994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (455521440).

390506994 is an abundant number, since it is smaller than the sum of its proper divisors (520535886).

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

390506994 is a wasteful number, since it uses less digits than its factorization.

390506994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1028 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 390506994 is about 19761.2498086533. The cubic root of 390506994 is about 730.9308161235.

It can be divided in two parts, 39050699 and 4, that added together give a triangular number (39050703 = T₈₈₃₇).

The spelling of 390506994 in words is "three hundred ninety million, five hundred six thousand, nine hundred ninety-four".