380949891 has 16 divisors (see below), whose sum is σ = 596185344. Its totient is φ = 211801824.

The previous prime is 380949871. The next prime is 380949911. The reversal of 380949891 is 198949083.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (380949871) and next prime (380949911).

It is not a de Polignac number, because 380949891 - 2⁵ = 380949859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (380949871) 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, 244365 + ... + 245918.

It is an arithmetic number, because the mean of its divisors is an integer number (37261584).

Almost surely, 2^380949891 is an apocalyptic number.

380949891 is a deficient number, since it is larger than the sum of its proper divisors (215235453).

380949891 is a wasteful number, since it uses less digits than its factorization.

380949891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490330.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 380949891 is about 19517.9376728178. The cubic root of 380949891 is about 724.9186692754.

The spelling of 380949891 in words is "three hundred eighty million, nine hundred forty-nine thousand, eight hundred ninety-one".