31230399 has 4 divisors (see below), whose sum is σ = 41640536. Its totient is φ = 20820264.

The previous prime is 31230391. The next prime is 31230401. The reversal of 31230399 is 99303213.

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

It is not a de Polignac number, because 31230399 - 2³ = 31230391 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 (31230391) 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, 5205064 + ... + 5205069.

It is an arithmetic number, because the mean of its divisors is an integer number (10410134).

Almost surely, 2^31230399 is an apocalyptic number.

31230399 is a deficient number, since it is larger than the sum of its proper divisors (10410137).

31230399 is a wasteful number, since it uses less digits than its factorization.

31230399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410136.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 31230399 is about 5588.4165020156. The cubic root of 31230399 is about 314.9143934668.

The spelling of 31230399 in words is "thirty-one million, two hundred thirty thousand, three hundred ninety-nine".