13640431 has 8 divisors (see below), whose sum is σ = 15750560. Its totient is φ = 11570688.

The previous prime is 13640401. The next prime is 13640437. The reversal of 13640431 is 13404631.

13640431 is digitally balanced in base 2 and base 8, because in such bases 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 a cyclic number.

It is not a de Polignac number, because 13640431 - 2⁹ = 13639919 is a prime.

It is a super-2 number, since 2×13640431² = 372122715731522, which contains 22 as substring.

13640431 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640437) 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, 9366 + ... + 10723.

It is an arithmetic number, because the mean of its divisors is an integer number (1968820).

Almost surely, 2^13640431 is an apocalyptic number.

13640431 is a deficient number, since it is larger than the sum of its proper divisors (2110129).

13640431 is an equidigital number, since it uses as much as digits as its factorization.

13640431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20193.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 13640431 is about 3693.2954119594. The cubic root of 13640431 is about 238.9329422112.

The spelling of 13640431 in words is "thirteen million, six hundred forty thousand, four hundred thirty-one".