13405864 has 8 divisors (see below), whose sum is σ = 25136010. Its totient is φ = 6702928.

The previous prime is 13405853. The next prime is 13405867. The reversal of 13405864 is 46850431.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12320100 + 1085764 = 3510^2 + 1042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (13405867) 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 as a sum of consecutive naturals, namely, 837859 + ... + 837874.

Almost surely, 2^13405864 is an apocalyptic number.

It is an amenable number.

13405864 is a deficient number, since it is larger than the sum of its proper divisors (11730146).

13405864 is a wasteful number, since it uses less digits than its factorization.

13405864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675739 (or 1675735 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 13405864 is about 3661.4019172989. The cubic root of 13405864 is about 237.5554160623. Note that the first 3 decimals are identical.

The spelling of 13405864 in words is "thirteen million, four hundred five thousand, eight hundred sixty-four".