13781274 has 24 divisors (see below), whose sum is σ = 29848032. Its totient is φ = 4240080.

The previous prime is 13781263. The next prime is 13781291. The reversal of 13781274 is 47218731.

It is a happy number.

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5782 + ... + 7809.

It is an arithmetic number, because the mean of its divisors is an integer number (1243668).

Almost surely, 2^13781274 is an apocalyptic number.

13781274 is an abundant number, since it is smaller than the sum of its proper divisors (16066758).

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

13781274 is a wasteful number, since it uses less digits than its factorization.

13781274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13622 (or 13609 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 13781274 is about 3712.3138337161. The cubic root of 13781274 is about 239.7524878839.

The spelling of 13781274 in words is "thirteen million, seven hundred eighty-one thousand, two hundred seventy-four".