13421865 has 8 divisors (see below), whose sum is σ = 21475008. Its totient is φ = 7158320.

The previous prime is 13421843. The next prime is 13421869. The reversal of 13421865 is 56812431.

13421865 = 855² + 856² + ... + 872².

13421865 is digitally balanced in base 2, because in such base 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 not a de Polignac number, because 13421865 - 2⁵ = 13421833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13421869) 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, 447381 + ... + 447410.

It is an arithmetic number, because the mean of its divisors is an integer number (2684376).

Almost surely, 2^13421865 is an apocalyptic number.

13421865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13421865 is a deficient number, since it is larger than the sum of its proper divisors (8053143).

13421865 is an equidigital number, since it uses as much as digits as its factorization.

13421865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894799.

The product of its digits is 5760, while the sum is 30.

The square root of 13421865 is about 3663.5863576556. The cubic root of 13421865 is about 237.6498924520.

The spelling of 13421865 in words is "thirteen million, four hundred twenty-one thousand, eight hundred sixty-five".