3978916 has 12 divisors (see below), whose sum is σ = 7203420. Its totient is φ = 1920800.

The previous prime is 3978899. The next prime is 3978917. The reversal of 3978916 is 6198793.

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 2876416 = 1050^2 + 1696^2 .

It is not an unprimeable number, because it can be changed into a prime (3978917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17035 + ... + 17266.

It is an arithmetic number, because the mean of its divisors is an integer number (600285).

Almost surely, 2^3978916 is an apocalyptic number.

It is an amenable number.

3978916 is a deficient number, since it is larger than the sum of its proper divisors (3224504).

3978916 is a wasteful number, since it uses less digits than its factorization.

3978916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34334 (or 34332 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 3978916 is about 1994.7220357734. The cubic root of 3978916 is about 158.4607073534.

The spelling of 3978916 in words is "three million, nine hundred seventy-eight thousand, nine hundred sixteen".