381656 has 16 divisors (see below), whose sum is σ = 780840. Its totient is φ = 173440.

The previous prime is 381637. The next prime is 381659. The reversal of 381656 is 656183.

It is a super-2 number, since 2×381656² = 291322604672, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081 + ... + 2256.

2³⁸¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

381656 is an abundant number, since it is smaller than the sum of its proper divisors (399184).

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

381656 is a wasteful number, since it uses less digits than its factorization.

381656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4354 (or 4350 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 381656 is about 617.7831334700. The cubic root of 381656 is about 72.5366283406.

The spelling of 381656 in words is "three hundred eighty-one thousand, six hundred fifty-six".