13439431 has 8 divisors (see below), whose sum is σ = 13850928. Its totient is φ = 13032000.

The previous prime is 13439417. The next prime is 13439449. The reversal of 13439431 is 13493431.

13439431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13439431 - 2¹³ = 13431239 is a prime.

It is a super-2 number, since 2×13439431² = 361236611207522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13439431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13439411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6516 + ... + 8326.

It is an arithmetic number, because the mean of its divisors is an integer number (1731366).

Almost surely, 2^13439431 is an apocalyptic number.

13439431 is a deficient number, since it is larger than the sum of its proper divisors (411497).

13439431 is a wasteful number, since it uses less digits than its factorization.

13439431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033.

The product of its digits is 3888, while the sum is 28.

The square root of 13439431 is about 3665.9829514061. The cubic root of 13439431 is about 237.7535228136.

The spelling of 13439431 in words is "thirteen million, four hundred thirty-nine thousand, four hundred thirty-one".