13978898 has 4 divisors (see below), whose sum is σ = 20968350. Its totient is φ = 6989448.

The previous prime is 13978897. The next prime is 13978901. The reversal of 13978898 is 89887931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11377129 + 2601769 = 3373^2 + 1613^2 .

It is not an unprimeable number, because it can be changed into a prime (13978897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494723 + ... + 3494726.

Almost surely, 2^13978898 is an apocalyptic number.

13978898 is a deficient number, since it is larger than the sum of its proper divisors (6989452).

13978898 is an equidigital number, since it uses as much as digits as its factorization.

13978898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6989451.

The product of its digits is 870912, while the sum is 53.

The square root of 13978898 is about 3738.8364500202. The cubic root of 13978898 is about 240.8930730928.

The spelling of 13978898 in words is "thirteen million, nine hundred seventy-eight thousand, eight hundred ninety-eight".