3999478 has 24 divisors (see below), whose sum is σ = 7173792. Its totient is φ = 1666224.

The previous prime is 3999467. The next prime is 3999487. The reversal of 3999478 is 8749993.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3075 + ... + 4177.

It is an arithmetic number, because the mean of its divisors is an integer number (298908).

Almost surely, 2^3999478 is an apocalyptic number.

3999478 is a deficient number, since it is larger than the sum of its proper divisors (3174314).

3999478 is a wasteful number, since it uses less digits than its factorization.

3999478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1149 counting only the distinct ones).

The product of its digits is 489888, while the sum is 49.

The square root of 3999478 is about 1999.8694957422. The cubic root of 3999478 is about 158.7331997018.

The spelling of 3999478 in words is "three million, nine hundred ninety-nine thousand, four hundred seventy-eight".