3978990 has 32 divisors (see below), whose sum is σ = 10611360. Its totient is φ = 1060992.

The previous prime is 3978979. The next prime is 3979013. The reversal of 3978990 is 998793.

It is a happy number.

It is a super-2 number, since 2×3978990² = 31664722840200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7099 + ... + 7638.

It is an arithmetic number, because the mean of its divisors is an integer number (331605).

Almost surely, 2^3978990 is an apocalyptic number.

3978990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3978990 is an abundant number, since it is smaller than the sum of its proper divisors (6632370).

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

3978990 is a wasteful number, since it uses less digits than its factorization.

3978990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14753 (or 14747 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 3978990 is about 1994.7405846375. The cubic root of 3978990 is about 158.4616896997.

The spelling of 3978990 in words is "three million, nine hundred seventy-eight thousand, nine hundred ninety".