390834780 has 120 divisors (see below), whose sum is σ = 1277121552. Its totient is φ = 89300736.

The previous prime is 390834767. The next prime is 390834797. The reversal of 390834780 is 87438093.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 142704 + ... + 145416.

Almost surely, 2^390834780 is an apocalyptic number.

390834780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390834780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (638560776).

390834780 is an abundant number, since it is smaller than the sum of its proper divisors (886286772).

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

390834780 is a wasteful number, since it uses less digits than its factorization.

390834780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753 (or 2730 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 390834780 is about 19769.5417245823. The cubic root of 390834780 is about 731.1352698957.

The spelling of 390834780 in words is "three hundred ninety million, eight hundred thirty-four thousand, seven hundred eighty".