389790720 has 264 divisors, whose sum is σ = 1475313840. Its totient is φ = 94371840.

The previous prime is 389790703. The next prime is 389790733. The reversal of 389790720 is 27097983.

It is a tau number, because it is divible by the number of its divisors (264).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 506496 + ... + 507264.

It is an arithmetic number, because the mean of its divisors is an integer number (5588310).

Almost surely, 2^389790720 is an apocalyptic number.

389790720 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 389790720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737656920).

389790720 is an abundant number, since it is smaller than the sum of its proper divisors (1085523120).

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

389790720 is a wasteful number, since it uses less digits than its factorization.

389790720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 389790720 is about 19743.1182947375. The cubic root of 389790720 is about 730.4836477217.

The spelling of 389790720 in words is "three hundred eighty-nine million, seven hundred ninety thousand, seven hundred twenty".