380505720 has 64 divisors (see below), whose sum is σ = 1304593920. Its totient is φ = 86972544.

The previous prime is 380505677. The next prime is 380505731. The reversal of 380505720 is 27505083.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225652 + ... + 227331.

It is an arithmetic number, because the mean of its divisors is an integer number (20384280).

Almost surely, 2^380505720 is an apocalyptic number.

380505720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

380505720 is an abundant number, since it is smaller than the sum of its proper divisors (924088200).

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

380505720 is a wasteful number, since it uses less digits than its factorization.

380505720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453004 (or 453000 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 380505720 is about 19506.5558210567. Note that the first 3 decimals coincide. The cubic root of 380505720 is about 724.6368184946.

The spelling of 380505720 in words is "three hundred eighty million, five hundred five thousand, seven hundred twenty".