13491099840 has 112 divisors (see below), whose sum is σ = 43992040032. Its totient is φ = 3500384256.

The previous prime is 13491099829. The next prime is 13491099841. The reversal of 13491099840 is 4899019431.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 13491099840.

It is not an unprimeable number, because it can be changed into a prime (13491099841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154389 + ... + 225428.

Almost surely, 2^13491099840 is an apocalyptic number.

13491099840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13491099840 is an abundant number, since it is smaller than the sum of its proper divisors (30500940192).

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

13491099840 is a wasteful number, since it uses less digits than its factorization.

13491099840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379874 (or 379864 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 13491099840 in words is "thirteen billion, four hundred ninety-one million, ninety-nine thousand, eight hundred forty".