3981690 has 32 divisors (see below), whose sum is σ = 10618560. Its totient is φ = 1061712.

The previous prime is 3981683. The next prime is 3981707. The reversal of 3981690 is 961893.

It is a super-2 number, since 2×3981690² = 31707710512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7104 + ... + 7643.

It is an arithmetic number, because the mean of its divisors is an integer number (331830).

Almost surely, 2^3981690 is an apocalyptic number.

3981690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3981690 is an abundant number, since it is smaller than the sum of its proper divisors (6636870).

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

3981690 is a wasteful number, since it uses less digits than its factorization.

3981690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14763 (or 14757 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 3981690 is about 1995.4172495997. The cubic root of 3981690 is about 158.4975237367.

The spelling of 3981690 in words is "three million, nine hundred eighty-one thousand, six hundred ninety".