13640723 has 2 divisors, whose sum is σ = 13640724. Its totient is φ = 13640722.

The previous prime is 13640699. The next prime is 13640743. The reversal of 13640723 is 32704631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13640723 - 2¹⁸ = 13378579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13640692 and 13640701.

It is not a weakly prime, because it can be changed into another prime (13640743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820361 + 6820362.

It is an arithmetic number, because the mean of its divisors is an integer number (6820362).

Almost surely, 2^13640723 is an apocalyptic number.

13640723 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640723 is an equidigital number, since it uses as much as digits as its factorization.

13640723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 13640723 is about 3693.3349428396. The cubic root of 13640723 is about 238.9346471407.

The spelling of 13640723 in words is "thirteen million, six hundred forty thousand, seven hundred twenty-three".