13400431 has 4 divisors (see below), whose sum is σ = 14618664. Its totient is φ = 12182200.

The previous prime is 13400417. The next prime is 13400441.

13400431 is nontrivially palindromic in base 10.

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 13400431 - 2¹¹ = 13398383 is a prime.

It is a super-2 number, since 2×13400431² = 359143101971522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13400441) 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, 609100 + ... + 609121.

It is an arithmetic number, because the mean of its divisors is an integer number (3654666).

Almost surely, 2^13400431 is an apocalyptic number.

13400431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13400431 is a deficient number, since it is larger than the sum of its proper divisors (1218233).

13400431 is a wasteful number, since it uses less digits than its factorization.

13400431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218232.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13400431 is about 3660.6599131851. The cubic root of 13400431 is about 237.5233203324.

It can be divided in two parts, 13400 and 431, that added together give a palindrome (13831).

The spelling of 13400431 in words is "thirteen million, four hundred thousand, four hundred thirty-one".