13721677 has 4 divisors (see below), whose sum is σ = 13730236. Its totient is φ = 13713120.

The previous prime is 13721671. The next prime is 13721681. The reversal of 13721677 is 77612731.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1929321 + 11792356 = 1389^2 + 3434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13721677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721671) 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, 1074 + ... + 5347.

It is an arithmetic number, because the mean of its divisors is an integer number (3432559).

Almost surely, 2^13721677 is an apocalyptic number.

It is an amenable number.

13721677 is a deficient number, since it is larger than the sum of its proper divisors (8559).

13721677 is an equidigital number, since it uses as much as digits as its factorization.

13721677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8558.

The product of its digits is 12348, while the sum is 34.

The square root of 13721677 is about 3704.2782022953. The cubic root of 13721677 is about 239.4063859797.

The spelling of 13721677 in words is "thirteen million, seven hundred twenty-one thousand, six hundred seventy-seven".