13400731 has 4 divisors (see below), whose sum is σ = 13423000. Its totient is φ = 13378464.

The previous prime is 13400707. The next prime is 13400741. The reversal of 13400731 is 13700431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13700431 = 881 ⋅15551.

It is a cyclic number.

It is not a de Polignac number, because 13400731 - 2¹³ = 13392539 is a prime.

It is a super-2 number, since 2×13400731² = 359159182668722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13400699 and 13400708.

It is not an unprimeable number, because it can be changed into a prime (13400741) 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, 10206 + ... + 11443.

It is an arithmetic number, because the mean of its divisors is an integer number (3355750).

Almost surely, 2^13400731 is an apocalyptic number.

13400731 is a deficient number, since it is larger than the sum of its proper divisors (22269).

13400731 is an equidigital number, since it uses as much as digits as its factorization.

13400731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22268.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 13400731 is about 3660.7008891741. The cubic root of 13400731 is about 237.5250928243.

The spelling of 13400731 in words is "thirteen million, four hundred thousand, seven hundred thirty-one".