381970656 has 36 divisors (see below), whose sum is σ = 1086229872. Its totient is φ = 127323456.

The previous prime is 381970651. The next prime is 381970681. The reversal of 381970656 is 656079183.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381970651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662856 + ... + 663431.

It is an arithmetic number, because the mean of its divisors is an integer number (30173052).

Almost surely, 2^381970656 is an apocalyptic number.

381970656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

381970656 is an abundant number, since it is smaller than the sum of its proper divisors (704259216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381970656 is a wasteful number, since it uses less digits than its factorization.

381970656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326303 (or 1326292 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 381970656 is about 19544.0695864500. The cubic root of 381970656 is about 725.5655712090.

The spelling of 381970656 in words is "three hundred eighty-one million, nine hundred seventy thousand, six hundred fifty-six".