13905424 has 20 divisors (see below), whose sum is σ = 29014636. Its totient is φ = 6417792.

The previous prime is 13905407. The next prime is 13905427. The reversal of 13905424 is 42450931.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 5143824 = 2960^2 + 2268^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13905392 and 13905401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13905427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33219 + ... + 33634.

Almost surely, 2^13905424 is an apocalyptic number.

It is an amenable number.

13905424 is an abundant number, since it is smaller than the sum of its proper divisors (15109212).

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

13905424 is a wasteful number, since it uses less digits than its factorization.

13905424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66874 (or 66868 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 13905424 is about 3728.9977205678. The cubic root of 13905424 is about 240.4702815819.

The spelling of 13905424 in words is "thirteen million, nine hundred five thousand, four hundred twenty-four".