390902020 has 48 divisors (see below), whose sum is σ = 886152960. Its totient is φ = 144400256.

The previous prime is 390902011. The next prime is 390902023. The reversal of 390902020 is 20209093.

It is not an unprimeable number, because it can be changed into a prime (390902023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1312 + ... + 27991.

It is an arithmetic number, because the mean of its divisors is an integer number (18461520).

Almost surely, 2^390902020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390902020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443076480).

390902020 is an abundant number, since it is smaller than the sum of its proper divisors (495250940).

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

390902020 is a wasteful number, since it uses less digits than its factorization.

390902020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29364 (or 29362 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 390902020 is about 19771.2422472641. The cubic root of 390902020 is about 731.1771961512.

The spelling of 390902020 in words is "three hundred ninety million, nine hundred two thousand, twenty".