13430731 has 4 divisors (see below), whose sum is σ = 14220792. Its totient is φ = 12640672.

The previous prime is 13430713. The next prime is 13430737. The reversal of 13430731 is 13703431.

It is a happy number.

13430731 is nontrivially palindromic in base 13.

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

It is a cyclic number.

It is not a de Polignac number, because 13430731 - 2⁵ = 13430699 is a prime.

It is a super-2 number, since 2×13430731² = 360769070388722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13430737) 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, 395005 + ... + 395038.

It is an arithmetic number, because the mean of its divisors is an integer number (3555198).

Almost surely, 2^13430731 is an apocalyptic number.

13430731 is a deficient number, since it is larger than the sum of its proper divisors (790061).

13430731 is an equidigital number, since it uses as much as digits as its factorization.

13430731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790060.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 13430731 is about 3664.7961744141. The cubic root of 13430731 is about 237.7022085839.

It can be divided in two parts, 13430 and 731, that added together give a square (14161 = 119²).

The spelling of 13430731 in words is "thirteen million, four hundred thirty thousand, seven hundred thirty-one".