13440989 has 4 divisors (see below), whose sum is σ = 13768860. Its totient is φ = 13113120.

The previous prime is 13440971. The next prime is 13440997. The reversal of 13440989 is 98904431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98904431 = 271 ⋅364961.

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 12355225 = 1042^2 + 3515^2 .

It is a cyclic number.

It is not a de Polignac number, because 13440989 - 2¹² = 13436893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440929) 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, 163874 + ... + 163955.

It is an arithmetic number, because the mean of its divisors is an integer number (3442215).

Almost surely, 2^13440989 is an apocalyptic number.

It is an amenable number.

13440989 is a deficient number, since it is larger than the sum of its proper divisors (327871).

13440989 is an equidigital number, since it uses as much as digits as its factorization.

13440989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327870.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 13440989 is about 3666.1954394167. The cubic root of 13440989 is about 237.7627098512.

The spelling of 13440989 in words is "thirteen million, four hundred forty thousand, nine hundred eighty-nine".