3990478 has 16 divisors (see below), whose sum is σ = 6377184. Its totient is φ = 1866240.

The previous prime is 3990473. The next prime is 3990509. The reversal of 3990478 is 8740993.

It is a self number, because there is not a number n which added to its sum of digits gives 3990478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990473) 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, 7951 + ... + 8437.

It is an arithmetic number, because the mean of its divisors is an integer number (398574).

Almost surely, 2^3990478 is an apocalyptic number.

3990478 is a deficient number, since it is larger than the sum of its proper divisors (2386706).

3990478 is a wasteful number, since it uses less digits than its factorization.

3990478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 3990478 is about 1997.6180816162. The cubic root of 3990478 is about 158.6140448415.

The spelling of 3990478 in words is "three million, nine hundred ninety thousand, four hundred seventy-eight".