39999421 has 16 divisors (see below), whose sum is σ = 50042880. Its totient is φ = 31060080.

The previous prime is 39999391. The next prime is 39999431. The reversal of 39999421 is 12499993.

It is a cyclic number.

It is not a de Polignac number, because 39999421 - 2⁷ = 39999293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39999431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26920 + ... + 28366.

It is an arithmetic number, because the mean of its divisors is an integer number (3127680).

Almost surely, 2^39999421 is an apocalyptic number.

It is an amenable number.

39999421 is a deficient number, since it is larger than the sum of its proper divisors (10043459).

39999421 is a wasteful number, since it uses less digits than its factorization.

39999421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824.

The product of its digits is 157464, while the sum is 46.

The square root of 39999421 is about 6324.5095462020. The cubic root of 39999421 is about 341.9935392006.

The spelling of 39999421 in words is "thirty-nine million, nine hundred ninety-nine thousand, four hundred twenty-one".