380640921 has 16 divisors (see below), whose sum is σ = 536198400. Its totient is φ = 239794688.

The previous prime is 380640917. The next prime is 380640947. The reversal of 380640921 is 129046083.

It is a cyclic number.

It is not a de Polignac number, because 380640921 - 2² = 380640917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (385640921) 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, 42456 + ... + 50633.

It is an arithmetic number, because the mean of its divisors is an integer number (33512400).

Almost surely, 2^380640921 is an apocalyptic number.

It is an amenable number.

380640921 is a deficient number, since it is larger than the sum of its proper divisors (155557479).

380640921 is a wasteful number, since it uses less digits than its factorization.

380640921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93168.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 380640921 is about 19510.0210404807. The cubic root of 380640921 is about 724.7226341306.

The spelling of 380640921 in words is "three hundred eighty million, six hundred forty thousand, nine hundred twenty-one".