13499840 has 28 divisors (see below), whose sum is σ = 32147256. Its totient is φ = 5399808.

The previous prime is 13499839. The next prime is 13499851. The reversal of 13499840 is 4899431.

It is a junction number, because it is equal to n+sod(n) for n = 13499794 and 13499803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20774 + ... + 21413.

Almost surely, 2^13499840 is an apocalyptic number.

13499840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13499840 is an abundant number, since it is smaller than the sum of its proper divisors (18647416).

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

13499840 is an equidigital number, since it uses as much as digits as its factorization.

13499840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42204 (or 42194 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 13499840 is about 3674.2128408681. The cubic root of 13499840 is about 238.1092171094.

The spelling of 13499840 in words is "thirteen million, four hundred ninety-nine thousand, eight hundred forty".