381021656 has 8 divisors (see below), whose sum is σ = 714415620. Its totient is φ = 190510824.

The previous prime is 381021647. The next prime is 381021673. The reversal of 381021656 is 656120183.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23813846 + ... + 23813861.

Almost surely, 2^381021656 is an apocalyptic number.

It is an amenable number.

381021656 is a deficient number, since it is larger than the sum of its proper divisors (333393964).

381021656 is a wasteful number, since it uses less digits than its factorization.

381021656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47627713 (or 47627709 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 381021656 is about 19519.7760233052. The cubic root of 381021656 is about 724.9641875295.

The spelling of 381021656 in words is "three hundred eighty-one million, twenty-one thousand, six hundred fifty-six".