3978926 has 16 divisors (see below), whose sum is σ = 6967296. Its totient is φ = 1668696.

The previous prime is 3978917. The next prime is 3978967. The reversal of 3978926 is 6298793.

It is a super-2 number, since 2×3978926² = 31663704226952, which contains 22 as substring.

It is an Ulam number.

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, 2366 + ... + 3681.

It is an arithmetic number, because the mean of its divisors is an integer number (435456).

Almost surely, 2^3978926 is an apocalyptic number.

3978926 is a deficient number, since it is larger than the sum of its proper divisors (2988370).

3978926 is a wasteful number, since it uses less digits than its factorization.

3978926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6103.

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

The square root of 3978926 is about 1994.7245423867. The cubic root of 3978926 is about 158.4608401037.

The spelling of 3978926 in words is "three million, nine hundred seventy-eight thousand, nine hundred twenty-six".