381640969 has 24 divisors (see below), whose sum is σ = 411816960. Its totient is φ = 353414880.

The previous prime is 381640951. The next prime is 381640979. The reversal of 381640969 is 969046183.

It is not a de Polignac number, because 381640969 - 2²³ = 373252361 is a prime.

It is a super-2 number, since 2×381640969² = 291299658438517922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381640979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3004984 + ... + 3005110.

It is an arithmetic number, because the mean of its divisors is an integer number (17159040).

Almost surely, 2^381640969 is an apocalyptic number.

It is an amenable number.

381640969 is a deficient number, since it is larger than the sum of its proper divisors (30175991).

381640969 is a wasteful number, since it uses less digits than its factorization.

381640969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 381640969 is about 19535.6333145358. The cubic root of 381640969 is about 725.3567607606.

The spelling of 381640969 in words is "three hundred eighty-one million, six hundred forty thousand, nine hundred sixty-nine".