13404840 has 64 divisors (see below), whose sum is σ = 42586560. Its totient is φ = 3363840.

The previous prime is 13404829. The next prime is 13404877. The reversal of 13404840 is 4840431.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 13404840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1246 + ... + 5325.

It is an arithmetic number, because the mean of its divisors is an integer number (665415).

Almost surely, 2^13404840 is an apocalyptic number.

13404840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13404840 is an abundant number, since it is smaller than the sum of its proper divisors (29181720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13404840 is a wasteful number, since it uses less digits than its factorization.

13404840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6602 (or 6598 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 13404840 is about 3661.2620774809. The cubic root of 13404840 is about 237.5493673923.

The spelling of 13404840 in words is "thirteen million, four hundred four thousand, eight hundred forty".