3981970 has 16 divisors (see below), whose sum is σ = 7202520. Its totient is φ = 1585024.

The previous prime is 3981959. The next prime is 3981973. The reversal of 3981970 is 791893.

It can be written as a sum of positive squares in 4 ways, for example, as 1968409 + 2013561 = 1403^2 + 1419^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476 + ... + 3184.

Almost surely, 2^3981970 is an apocalyptic number.

3981970 is a deficient number, since it is larger than the sum of its proper divisors (3220550).

3981970 is a wasteful number, since it uses less digits than its factorization.

3981970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 3981970 is about 1995.4874091309. The cubic root of 3981970 is about 158.5012389319.

The spelling of 3981970 in words is "three million, nine hundred eighty-one thousand, nine hundred seventy".