380721965 has 16 divisors (see below), whose sum is σ = 494868528. Its totient is φ = 279515136.

The previous prime is 380721961. The next prime is 380721977. The reversal of 380721965 is 569127083.

It can be written as a sum of positive squares in 8 ways, for example, as 47513449 + 333208516 = 6893^2 + 18254^2 .

It is a cyclic number.

It is not a de Polignac number, because 380721965 - 2² = 380721961 is a prime.

It is a super-2 number, since 2×380721965² = 289898429266922450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (380721961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5684 + ... + 28173.

It is an arithmetic number, because the mean of its divisors is an integer number (30929283).

Almost surely, 2^380721965 is an apocalyptic number.

It is an amenable number.

380721965 is a deficient number, since it is larger than the sum of its proper divisors (114146563).

380721965 is a wasteful number, since it uses less digits than its factorization.

380721965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34048.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 380721965 is about 19512.0979138585. The cubic root of 380721965 is about 724.7740651512.

The spelling of 380721965 in words is "three hundred eighty million, seven hundred twenty-one thousand, nine hundred sixty-five".