13991698 has 16 divisors (see below), whose sum is σ = 24634944. Its totient is φ = 5834160.

The previous prime is 13991693. The next prime is 13991699. The reversal of 13991698 is 89619931.

It is a super-2 number, since 2×13991698² = 391535225846408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13991693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12988 + ... + 14023.

It is an arithmetic number, because the mean of its divisors is an integer number (1539684).

Almost surely, 2^13991698 is an apocalyptic number.

13991698 is a deficient number, since it is larger than the sum of its proper divisors (10643246).

13991698 is a wasteful number, since it uses less digits than its factorization.

13991698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27057.

The product of its digits is 104976, while the sum is 46.

The square root of 13991698 is about 3740.5478208412. The cubic root of 13991698 is about 240.9665765187.

The spelling of 13991698 in words is "thirteen million, nine hundred ninety-one thousand, six hundred ninety-eight".