382889921 has 2 divisors, whose sum is σ = 382889922. Its totient is φ = 382889920.

The previous prime is 382889917. The next prime is 382889951. The reversal of 382889921 is 129988283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279257521 + 103632400 = 16711^2 + 10180^2 .

It is a cyclic number.

It is not a de Polignac number, because 382889921 - 2² = 382889917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 382889921.

It is not a weakly prime, because it can be changed into another prime (382889911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191444960 + 191444961.

It is an arithmetic number, because the mean of its divisors is an integer number (191444961).

Almost surely, 2^382889921 is an apocalyptic number.

It is an amenable number.

382889921 is a deficient number, since it is larger than the sum of its proper divisors (1).

382889921 is an equidigital number, since it uses as much as digits as its factorization.

382889921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 382889921 is about 19567.5732016007. The cubic root of 382889921 is about 726.1471627293.

The spelling of 382889921 in words is "three hundred eighty-two million, eight hundred eighty-nine thousand, nine hundred twenty-one".