3981630 has 16 divisors (see below), whose sum is σ = 9555984. Its totient is φ = 1061760.

The previous prime is 3981629. The next prime is 3981641. The reversal of 3981630 is 361893.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 132721 = 3981630 / (3 + 9 + 8 + 1 + 6 + 3 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66331 + ... + 66390.

It is an arithmetic number, because the mean of its divisors is an integer number (597249).

Almost surely, 2^3981630 is an apocalyptic number.

3981630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3981630 is an abundant number, since it is smaller than the sum of its proper divisors (5574354).

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

3981630 is a wasteful number, since it uses less digits than its factorization.

3981630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132731.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 3981630 is about 1995.4022150935. The cubic root of 3981630 is about 158.4967276008.

The spelling of 3981630 in words is "three million, nine hundred eighty-one thousand, six hundred thirty".