13400989 has 4 divisors (see below), whose sum is σ = 15315424. Its totient is φ = 11486556.

The previous prime is 13400971. The next prime is 13401041. The reversal of 13400989 is 98900431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98900431 = 7 ⋅14128633.

It is a cyclic number.

It is not a de Polignac number, because 13400989 - 2⁷ = 13400861 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 (13400089) 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, 957207 + ... + 957220.

It is an arithmetic number, because the mean of its divisors is an integer number (3828856).

Almost surely, 2^13400989 is an apocalyptic number.

It is an amenable number.

13400989 is a deficient number, since it is larger than the sum of its proper divisors (1914435).

13400989 is an equidigital number, since it uses as much as digits as its factorization.

13400989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914434.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13400989 is about 3660.7361281578. The cubic root of 13400989 is about 237.5266171461.

The spelling of 13400989 in words is "thirteen million, four hundred thousand, nine hundred eighty-nine".