13904144436 has 144 divisors (see below), whose sum is σ = 40702268544. Its totient is φ = 3616524288.

The previous prime is 13904144431. The next prime is 13904144447. The reversal of 13904144436 is 63444140931.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 13904144394 and 13904144403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13904144431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1029600 + ... + 1043016.

Almost surely, 2^13904144436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13904144436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20351134272).

13904144436 is an abundant number, since it is smaller than the sum of its proper divisors (26798124108).

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

13904144436 is a wasteful number, since it uses less digits than its factorization.

13904144436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13530 (or 13515 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 13904144436 in words is "thirteen billion, nine hundred four million, one hundred forty-four thousand, four hundred thirty-six".