13920645 has 8 divisors (see below), whose sum is σ = 22273056. Its totient is φ = 7424336.

The previous prime is 13920587. The next prime is 13920649. The reversal of 13920645 is 54602931.

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 13920645 - 2⁹ = 13920133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13920649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464007 + ... + 464036.

It is an arithmetic number, because the mean of its divisors is an integer number (2784132).

Almost surely, 2^13920645 is an apocalyptic number.

13920645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13920645 is a deficient number, since it is larger than the sum of its proper divisors (8352411).

13920645 is an equidigital number, since it uses as much as digits as its factorization.

13920645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928051.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 13920645 is about 3731.0380593074. The cubic root of 13920645 is about 240.5579898861.

The spelling of 13920645 in words is "thirteen million, nine hundred twenty thousand, six hundred forty-five".