39090720 has 48 divisors (see below), whose sum is σ = 123137280. Its totient is φ = 10424064.

The previous prime is 39090719. The next prime is 39090739. The reversal of 39090720 is 2709093.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40240 + ... + 41199.

It is an arithmetic number, because the mean of its divisors is an integer number (2565360).

Almost surely, 2^39090720 is an apocalyptic number.

39090720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

39090720 is an abundant number, since it is smaller than the sum of its proper divisors (84046560).

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

39090720 is a wasteful number, since it uses less digits than its factorization.

39090720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81457 (or 81449 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 39090720 is about 6252.2571924066. The cubic root of 39090720 is about 339.3838899957.

The spelling of 39090720 in words is "thirty-nine million, ninety thousand, seven hundred twenty".