3997801656 has 40 divisors (see below), whose sum is σ = 11197548120. Its totient is φ = 1332600336.

The previous prime is 3997801541. The next prime is 3997801667. The reversal of 3997801656 is 6561087993.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3084076 + ... + 3085371.

It is an arithmetic number, because the mean of its divisors is an integer number (279938703).

Almost surely, 2^3997801656 is an apocalyptic number.

3997801656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3997801656 is an abundant number, since it is smaller than the sum of its proper divisors (7199746464).

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

3997801656 is a wasteful number, since it uses less digits than its factorization.

3997801656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6169465 (or 6169452 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 3997801656 is about 63228.1713795362. The cubic root of 3997801656 is about 1587.1101942131.

The spelling of 3997801656 in words is "three billion, nine hundred ninety-seven million, eight hundred one thousand, six hundred fifty-six".