3978931 has 8 divisors (see below), whose sum is σ = 4529664. Its totient is φ = 3459720.

The previous prime is 3978917. The next prime is 3978967. The reversal of 3978931 is 1398793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3978931 - 2⁵ = 3978899 is a prime.

It is a super-2 number, since 2×3978931² = 31663783805522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3978971) 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, 7611 + ... + 8116.

It is an arithmetic number, because the mean of its divisors is an integer number (566208).

Almost surely, 2^3978931 is an apocalyptic number.

3978931 is a deficient number, since it is larger than the sum of its proper divisors (550733).

3978931 is a wasteful number, since it uses less digits than its factorization.

3978931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15761.

The product of its digits is 40824, while the sum is 40.

The square root of 3978931 is about 1994.7257956922. The cubic root of 3978931 is about 158.4609064787.

The spelling of 3978931 in words is "three million, nine hundred seventy-eight thousand, nine hundred thirty-one".