390739440 has 160 divisors (see below), whose sum is σ = 1490904576. Its totient is φ = 82437120.

The previous prime is 390739439. The next prime is 390739487. The reversal of 390739440 is 44937093.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12895 + ... + 30785.

Almost surely, 2^390739440 is an apocalyptic number.

390739440 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 390739440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745452288).

390739440 is an abundant number, since it is smaller than the sum of its proper divisors (1100165136).

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

390739440 is a wasteful number, since it uses less digits than its factorization.

390739440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17927 (or 17921 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 39.

The square root of 390739440 is about 19767.1302924830. The cubic root of 390739440 is about 731.0758141623.

The spelling of 390739440 in words is "three hundred ninety million, seven hundred thirty-nine thousand, four hundred forty".