39993428 has 24 divisors (see below), whose sum is σ = 71904000. Its totient is φ = 19454688.

The previous prime is 39993427. The next prime is 39993431. The reversal of 39993428 is 82439993.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39993427) 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, 36878 + ... + 37946.

It is an arithmetic number, because the mean of its divisors is an integer number (2996000).

Almost surely, 2^39993428 is an apocalyptic number.

It is an amenable number.

39993428 is a deficient number, since it is larger than the sum of its proper divisors (31910572).

39993428 is a wasteful number, since it uses less digits than its factorization.

39993428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319 (or 1317 counting only the distinct ones).

The product of its digits is 419904, while the sum is 47.

The square root of 39993428 is about 6324.0357367744. The cubic root of 39993428 is about 341.9764583729.

The spelling of 39993428 in words is "thirty-nine million, nine hundred ninety-three thousand, four hundred twenty-eight".