380997721 has 8 divisors (see below), whose sum is σ = 414290240. Its totient is φ = 348274512.

The previous prime is 380997713. The next prime is 380997739. The reversal of 380997721 is 127799083.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 380997721 - 2³ = 380997713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (380997821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140931 + ... + 143608.

It is an arithmetic number, because the mean of its divisors is an integer number (51786280).

Almost surely, 2^380997721 is an apocalyptic number.

It is an amenable number.

380997721 is a deficient number, since it is larger than the sum of its proper divisors (33292519).

380997721 is a wasteful number, since it uses less digits than its factorization.

380997721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284655.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 380997721 is about 19519.1629175024. The cubic root of 380997721 is about 724.9490069565.

The spelling of 380997721 in words is "three hundred eighty million, nine hundred ninety-seven thousand, seven hundred twenty-one".