13691772 has 18 divisors (see below), whose sum is σ = 34609848. Its totient is φ = 4563912.

The previous prime is 13691771. The next prime is 13691773. The reversal of 13691772 is 27719631.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (13691771) and next prime (13691773).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 380327 = 13691772 / (1 + 3 + 6 + 9 + 1 + 7 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13691771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 190128 + ... + 190199.

Almost surely, 2^13691772 is an apocalyptic number.

13691772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13691772 is an abundant number, since it is smaller than the sum of its proper divisors (20918076).

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

13691772 is a wasteful number, since it uses less digits than its factorization.

13691772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380337 (or 380332 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 13691772 is about 3700.2394517112. The cubic root of 13691772 is about 239.2323388528.

The spelling of 13691772 in words is "thirteen million, six hundred ninety-one thousand, seven hundred seventy-two".