39999429 has 6 divisors (see below), whose sum is σ = 57776966. Its totient is φ = 26666280.

The previous prime is 39999391. The next prime is 39999431. The reversal of 39999429 is 92499993.

39999429 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 19342404 = 4545^2 + 4398^2 .

It is not a de Polignac number, because 39999429 - 2⁷ = 39999301 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 (39999499) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2222182 + ... + 2222199.

Almost surely, 2^39999429 is an apocalyptic number.

It is an amenable number.

39999429 is a deficient number, since it is larger than the sum of its proper divisors (17777537).

39999429 is a wasteful number, since it uses less digits than its factorization.

39999429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444387 (or 4444384 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 39999429 is about 6324.5101786621. The cubic root of 39999429 is about 341.9935620005.

The spelling of 39999429 in words is "thirty-nine million, nine hundred ninety-nine thousand, four hundred twenty-nine".