3972986 has 16 divisors (see below), whose sum is σ = 6242184. Its totient is φ = 1894464.

The previous prime is 3972979. The next prime is 3973007. The reversal of 3972986 is 6892793.

It can be written as a sum of positive squares in 4 ways, for example, as 3308761 + 664225 = 1819^2 + 815^2 .

It is an Ulam 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, 3416 + ... + 4428.

Almost surely, 2^3972986 is an apocalyptic number.

3972986 is a deficient number, since it is larger than the sum of its proper divisors (2269198).

3972986 is a wasteful number, since it uses less digits than its factorization.

3972986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105.

The product of its digits is 163296, while the sum is 44.

The square root of 3972986 is about 1993.2350588930. The cubic root of 3972986 is about 158.3819472760.

The spelling of 3972986 in words is "three million, nine hundred seventy-two thousand, nine hundred eighty-six".