13981438 has 8 divisors (see below), whose sum is σ = 21027240. Its totient is φ = 6972360.

The previous prime is 13981427. The next prime is 13981441. The reversal of 13981438 is 83418931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 13981397 and 13981406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8208 + ... + 9763.

It is an arithmetic number, because the mean of its divisors is an integer number (2628405).

Almost surely, 2^13981438 is an apocalyptic number.

13981438 is a deficient number, since it is larger than the sum of its proper divisors (7045802).

13981438 is a wasteful number, since it uses less digits than its factorization.

13981438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18362.

The product of its digits is 20736, while the sum is 37.

The square root of 13981438 is about 3739.1761124611. The cubic root of 13981438 is about 240.9076624963.

The spelling of 13981438 in words is "thirteen million, nine hundred eighty-one thousand, four hundred thirty-eight".