31299439 has 4 divisors (see below), whose sum is σ = 32378760. Its totient is φ = 30220120.

The previous prime is 31299421. The next prime is 31299467. The reversal of 31299439 is 93499213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31299439 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31299409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539617 + ... + 539674.

It is an arithmetic number, because the mean of its divisors is an integer number (8094690).

Almost surely, 2^31299439 is an apocalyptic number.

31299439 is a deficient number, since it is larger than the sum of its proper divisors (1079321).

31299439 is a wasteful number, since it uses less digits than its factorization.

31299439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079320.

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

The square root of 31299439 is about 5594.5901547835. The cubic root of 31299439 is about 315.1462795869.

The spelling of 31299439 in words is "thirty-one million, two hundred ninety-nine thousand, four hundred thirty-nine".