3927978 has 24 divisors (see below), whose sum is σ = 8693568. Its totient is φ = 1281192.

The previous prime is 3927971. The next prime is 3927997. The reversal of 3927978 is 8797293.

It is a super-2 number, since 2×3927978² = 30858022336968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3927971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1476 + ... + 3167.

It is an arithmetic number, because the mean of its divisors is an integer number (362232).

Almost surely, 2^3927978 is an apocalyptic number.

3927978 is an abundant number, since it is smaller than the sum of its proper divisors (4765590).

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

3927978 is a wasteful number, since it uses less digits than its factorization.

3927978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4698 (or 4695 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 3927978 is about 1981.9127125078. The cubic root of 3927978 is about 157.7815975109.

It can be divided in two parts, 3927 and 978, that multiplied together give a triangular number (3840606 = T₂₇₇₁).

The spelling of 3927978 in words is "three million, nine hundred twenty-seven thousand, nine hundred seventy-eight".