39999906 has 20 divisors (see below), whose sum is σ = 89629782. Its totient is φ = 13333248.

The previous prime is 39999901. The next prime is 39999907. The reversal of 39999906 is 60999993.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 7338681 = 5715^2 + 2709^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39999901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 123295 + ... + 123618.

Almost surely, 2^39999906 is an apocalyptic number.

39999906 is an abundant number, since it is smaller than the sum of its proper divisors (49629876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39999906 is a wasteful number, since it uses less digits than its factorization.

39999906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246927 (or 246918 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 54.

The square root of 39999906 is about 6324.5478889799. The cubic root of 39999906 is about 341.9949214389.

The spelling of 39999906 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred six".