3993639 has 12 divisors (see below), whose sum is σ = 5766696. Its totient is φ = 2457312.

The previous prime is 3993631. The next prime is 3993653. The reversal of 3993639 is 9363993.

It is not a de Polignac number, because 3993639 - 2³ = 3993631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3993639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3993631) 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, 3432 + ... + 4445.

It is an arithmetic number, because the mean of its divisors is an integer number (480558).

Almost surely, 2^3993639 is an apocalyptic number.

3993639 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

3993639 is a deficient number, since it is larger than the sum of its proper divisors (1773057).

3993639 is a wasteful number, since it uses less digits than its factorization.

3993639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7906 (or 7893 counting only the distinct ones).

The product of its digits is 118098, while the sum is 42.

The square root of 3993639 is about 1998.4091172730. The cubic root of 3993639 is about 158.6559150692.

It can be divided in two parts, 39936 and 39, that multiplied together give a square (1557504 = 1248²).

The spelling of 3993639 in words is "three million, nine hundred ninety-three thousand, six hundred thirty-nine".