3971812 has 24 divisors (see below), whose sum is σ = 7927416. Its totient is φ = 1724928.

The previous prime is 3971809. The next prime is 3971833. The reversal of 3971812 is 2181793.

It can be written as a sum of positive squares in 4 ways, for example, as 1679616 + 2292196 = 1296^2 + 1514^2 .

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, 1363 + ... + 3130.

It is an arithmetic number, because the mean of its divisors is an integer number (330309).

Almost surely, 2^3971812 is an apocalyptic number.

It is an amenable number.

3971812 is a deficient number, since it is larger than the sum of its proper divisors (3955604).

3971812 is a wasteful number, since it uses less digits than its factorization.

3971812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527 (or 4525 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 3971812 is about 1992.9405410097. The cubic root of 3971812 is about 158.3663453481.

It can be divided in two parts, 397 and 1812, that added together give a square (2209 = 47²).

The spelling of 3971812 in words is "three million, nine hundred seventy-one thousand, eight hundred twelve".