13770840 has 32 divisors (see below), whose sum is σ = 41312880. Its totient is φ = 3672192.

The previous prime is 13770821. The next prime is 13770863. The reversal of 13770840 is 4807731.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 13770798 and 13770807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57259 + ... + 57498.

Almost surely, 2^13770840 is an apocalyptic number.

13770840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13770840 is an abundant number, since it is smaller than the sum of its proper divisors (27542040).

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

13770840 is a wasteful number, since it uses less digits than its factorization.

13770840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114771 (or 114767 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 13770840 is about 3710.9082446215. The cubic root of 13770840 is about 239.6919659261.

The spelling of 13770840 in words is "thirteen million, seven hundred seventy thousand, eight hundred forty".