13989278 has 8 divisors (see below), whose sum is σ = 21176760. Its totient is φ = 6930360.

The previous prime is 13989271. The next prime is 13989289. The reversal of 13989278 is 87298931.

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

It is a super-2 number, since 2×13989278² = 391399797922568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13989271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31868 + ... + 32303.

It is an arithmetic number, because the mean of its divisors is an integer number (2647095).

Almost surely, 2^13989278 is an apocalyptic number.

13989278 is a deficient number, since it is larger than the sum of its proper divisors (7187482).

13989278 is a wasteful number, since it uses less digits than its factorization.

13989278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64282.

The product of its digits is 217728, while the sum is 47.

The square root of 13989278 is about 3740.2243248233. The cubic root of 13989278 is about 240.9526832148.

The spelling of 13989278 in words is "thirteen million, nine hundred eighty-nine thousand, two hundred seventy-eight".