13781808 has 30 divisors (see below), whose sum is σ = 38570324. Its totient is φ = 4593888.

The previous prime is 13781777. The next prime is 13781827. The reversal of 13781808 is 80818731.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47710 + ... + 47997.

Almost surely, 2^13781808 is an apocalyptic number.

13781808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13781808 is an abundant number, since it is smaller than the sum of its proper divisors (24788516).

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

13781808 is a wasteful number, since it uses less digits than its factorization.

13781808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95721 (or 95712 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 13781808 is about 3712.3857558179. The cubic root of 13781808 is about 239.7555845056.

The spelling of 13781808 in words is "thirteen million, seven hundred eighty-one thousand, eight hundred eight".