31993429 has 16 divisors (see below), whose sum is σ = 35280000. Its totient is φ = 28835136.

The previous prime is 31993421. The next prime is 31993441. The reversal of 31993429 is 92439913.

It is a cyclic number.

It is not a de Polignac number, because 31993429 - 2³ = 31993421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31993391 and 31993400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31993421) 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 15 ways as a sum of consecutive naturals, for example, 160672 + ... + 160870.

It is an arithmetic number, because the mean of its divisors is an integer number (2205000).

Almost surely, 2^31993429 is an apocalyptic number.

It is an amenable number.

31993429 is a deficient number, since it is larger than the sum of its proper divisors (3286571).

31993429 is a wasteful number, since it uses less digits than its factorization.

31993429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444.

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

The square root of 31993429 is about 5656.2734198410. The cubic root of 31993429 is about 317.4584780471.

The spelling of 31993429 in words is "thirty-one million, nine hundred ninety-three thousand, four hundred twenty-nine".