3997656 has 48 divisors (see below), whose sum is σ = 11662560. Its totient is φ = 1229760.

The previous prime is 3997649. The next prime is 3997673. The reversal of 3997656 is 6567993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1200 + ... + 3071.

It is an arithmetic number, because the mean of its divisors is an integer number (242970).

Almost surely, 2^3997656 is an apocalyptic number.

3997656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3997656 is an abundant number, since it is smaller than the sum of its proper divisors (7664904).

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

3997656 is a wasteful number, since it uses less digits than its factorization.

3997656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296 (or 4289 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 3997656 is about 1999.4139141258. The cubic root of 3997656 is about 158.7090919042.

The spelling of 3997656 in words is "three million, nine hundred ninety-seven thousand, six hundred fifty-six".