39931429 has 4 divisors (see below), whose sum is σ = 40026700. Its totient is φ = 39836160.

The previous prime is 39931373. The next prime is 39931457. The reversal of 39931429 is 92413993.

39931429 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92413993 = 7 ⋅13201999.

It can be written as a sum of positive squares in 2 ways, for example, as 806404 + 39125025 = 898^2 + 6255^2 .

It is a cyclic number.

It is not a de Polignac number, because 39931429 - 2⁷ = 39931301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39931391 and 39931400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39931459) 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 3 ways as a sum of consecutive naturals, for example, 47004 + ... + 47845.

It is an arithmetic number, because the mean of its divisors is an integer number (10006675).

Almost surely, 2^39931429 is an apocalyptic number.

It is an amenable number.

39931429 is a deficient number, since it is larger than the sum of its proper divisors (95271).

39931429 is an equidigital number, since it uses as much as digits as its factorization.

39931429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95270.

The product of its digits is 52488, while the sum is 40.

The square root of 39931429 is about 6319.1319815304. The cubic root of 39931429 is about 341.7996529573.

The spelling of 39931429 in words is "thirty-nine million, nine hundred thirty-one thousand, four hundred twenty-nine".