3957978 has 48 divisors (see below), whose sum is σ = 8759520. Its totient is φ = 1190112.

The previous prime is 3957973. The next prime is 3957983. The reversal of 3957978 is 8797593.

It is an interprime number because it is at equal distance from previous prime (3957973) and next prime (3957983).

It is not an unprimeable number, because it can be changed into a prime (3957973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92025 + ... + 92067.

It is an arithmetic number, because the mean of its divisors is an integer number (182490).

Almost surely, 2^3957978 is an apocalyptic number.

3957978 is an abundant number, since it is smaller than the sum of its proper divisors (4801542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3957978 is a wasteful number, since it uses less digits than its factorization.

3957978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 100 counting only the distinct ones).

The product of its digits is 476280, while the sum is 48.

The square root of 3957978 is about 1989.4667627281. The cubic root of 3957978 is about 158.1822657598.

The spelling of 3957978 in words is "three million, nine hundred fifty-seven thousand, nine hundred seventy-eight".