13731898 has 4 divisors (see below), whose sum is σ = 20597850. Its totient is φ = 6865948.

The previous prime is 13731881. The next prime is 13731901. The reversal of 13731898 is 89813731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10517049 + 3214849 = 3243^2 + 1793^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13731898.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3432973 + ... + 3432976.

Almost surely, 2^13731898 is an apocalyptic number.

13731898 is a deficient number, since it is larger than the sum of its proper divisors (6865952).

13731898 is an equidigital number, since it uses as much as digits as its factorization.

13731898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6865951.

The product of its digits is 36288, while the sum is 40.

The square root of 13731898 is about 3705.6575664786. The cubic root of 13731898 is about 239.4658142201.

The spelling of 13731898 in words is "thirteen million, seven hundred thirty-one thousand, eight hundred ninety-eight".