13981998 has 16 divisors (see below), whose sum is σ = 28066896. Its totient is φ = 4643520.

The previous prime is 13981991. The next prime is 13982021. The reversal of 13981998 is 89918931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13981991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2461 + ... + 5832.

It is an arithmetic number, because the mean of its divisors is an integer number (1754181).

Almost surely, 2^13981998 is an apocalyptic number.

13981998 is an abundant number, since it is smaller than the sum of its proper divisors (14084898).

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

13981998 is a wasteful number, since it uses less digits than its factorization.

13981998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8579.

The product of its digits is 139968, while the sum is 48.

The square root of 13981998 is about 3739.2509945175. The cubic root of 13981998 is about 240.9108788199.

The spelling of 13981998 in words is "thirteen million, nine hundred eighty-one thousand, nine hundred ninety-eight".