380629891 has 2 divisors, whose sum is σ = 380629892. Its totient is φ = 380629890.

The previous prime is 380629877. The next prime is 380629919. The reversal of 380629891 is 198926083.

It is a weak prime.

It is an emirp because it is prime and its reverse (198926083) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 380629891 - 2⁵ = 380629859 is a prime.

It is a super-2 number, since 2×380629891² = 289758227845343762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (380629861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190314945 + 190314946.

It is an arithmetic number, because the mean of its divisors is an integer number (190314946).

Almost surely, 2^380629891 is an apocalyptic number.

380629891 is a deficient number, since it is larger than the sum of its proper divisors (1).

380629891 is an equidigital number, since it uses as much as digits as its factorization.

380629891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 380629891 is about 19509.7383631867. The cubic root of 380629891 is about 724.7156338604.

The spelling of 380629891 in words is "three hundred eighty million, six hundred twenty-nine thousand, eight hundred ninety-one".