13981398 has 32 divisors (see below), whose sum is σ = 28675296. Its totient is φ = 4543488.

The previous prime is 13981381. The next prime is 13981399. The reversal of 13981398 is 89318931.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13981399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59890 + ... + 60122.

It is an arithmetic number, because the mean of its divisors is an integer number (896103).

Almost surely, 2^13981398 is an apocalyptic number.

13981398 is an abundant number, since it is smaller than the sum of its proper divisors (14693898).

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

13981398 is a wasteful number, since it uses less digits than its factorization.

13981398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448.

The product of its digits is 46656, while the sum is 42.

The square root of 13981398 is about 3739.1707636854. The cubic root of 13981398 is about 240.9074327556.

The spelling of 13981398 in words is "thirteen million, nine hundred eighty-one thousand, three hundred ninety-eight".