3917978 has 8 divisors (see below), whose sum is σ = 5896800. Its totient is φ = 1952380.

The previous prime is 3917923. The next prime is 3917989. The reversal of 3917978 is 8797193.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2528 + ... + 3771.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^3917978 is an apocalyptic number.

3917978 is a deficient number, since it is larger than the sum of its proper divisors (1978822).

3917978 is a wasteful number, since it uses less digits than its factorization.

3917978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6612.

The product of its digits is 95256, while the sum is 44.

The square root of 3917978 is about 1979.3882893460. The cubic root of 3917978 is about 157.6475882040.

The spelling of 3917978 in words is "three million, nine hundred seventeen thousand, nine hundred seventy-eight".