13720345 has 12 divisors (see below), whose sum is σ = 16690860. Its totient is φ = 10827200.

The previous prime is 13720339. The next prime is 13720349. The reversal of 13720345 is 54302731.

13720345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 853776 + 12866569 = 924^2 + 3587^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13720345 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13720349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50871 + ... + 51139.

It is an arithmetic number, because the mean of its divisors is an integer number (1390905).

Almost surely, 2^13720345 is an apocalyptic number.

It is an amenable number.

13720345 is a deficient number, since it is larger than the sum of its proper divisors (2970515).

13720345 is an equidigital number, since it uses as much as digits as its factorization.

13720345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 13720345 is about 3704.0984058202. The cubic root of 13720345 is about 239.3986391223.

The spelling of 13720345 in words is "thirteen million, seven hundred twenty thousand, three hundred forty-five".