13709431 has 16 divisors (see below), whose sum is σ = 15120000. Its totient is φ = 12380256.

The previous prime is 13709419. The next prime is 13709491. The reversal of 13709431 is 13490731.

13709431 = 51³ + 52³ + ... + 88³.

13709431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13709431 - 2¹³ = 13701239 is a prime.

It is a super-2 number, since 2×13709431² = 375896996687522, 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 13709431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13709491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76500 + ... + 76678.

It is an arithmetic number, because the mean of its divisors is an integer number (945000).

Almost surely, 2^13709431 is an apocalyptic number.

13709431 is a deficient number, since it is larger than the sum of its proper divisors (1410569).

13709431 is a wasteful number, since it uses less digits than its factorization.

13709431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 13709431 is about 3702.6248797306. The cubic root of 13709431 is about 239.3351448529.

It can be divided in two parts, 1370 and 9431, that added together give a palindrome (10801).

The spelling of 13709431 in words is "thirteen million, seven hundred nine thousand, four hundred thirty-one".