13109776 has 20 divisors (see below), whose sum is σ = 26220544. Its totient is φ = 6343200.

The previous prime is 13109749. The next prime is 13109779. The reversal of 13109776 is 67790131.

13109776 = 321² + 322² + ... + 416².

It is a happy number.

13109776 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (13109779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12720 + ... + 13711.

Almost surely, 2^13109776 is an apocalyptic number.

13109776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13109776 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13109776 is a wasteful number, since it uses less digits than its factorization.

13109776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26470 (or 26464 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 13109776 is about 3620.7424652963. The cubic root of 13109776 is about 235.7934609708.

The spelling of 13109776 in words is "thirteen million, one hundred nine thousand, seven hundred seventy-six".