3978040 has 32 divisors (see below), whose sum is σ = 9765360. Its totient is φ = 1446400.

The previous prime is 3978031. The next prime is 3978043. The reversal of 3978040 is 408793.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3977993 and 3978011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978043) 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, 4081 + ... + 4960.

Almost surely, 2^3978040 is an apocalyptic number.

It is an amenable number.

3978040 is an abundant number, since it is smaller than the sum of its proper divisors (5787320).

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

3978040 is a wasteful number, since it uses less digits than its factorization.

3978040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9063 (or 9059 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 3978040 is about 1994.5024442201. The cubic root of 3978040 is about 158.4490775722.

The spelling of 3978040 in words is "three million, nine hundred seventy-eight thousand, forty".