13438987 has 4 divisors (see below), whose sum is σ = 13460040. Its totient is φ = 13417936.

The previous prime is 13438979. The next prime is 13439003. The reversal of 13438987 is 78983431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78983431 = 6599 ⋅11969.

It is a cyclic number.

It is not a de Polignac number, because 13438987 - 2³ = 13438979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13438967) 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, 9538 + ... + 10855.

It is an arithmetic number, because the mean of its divisors is an integer number (3365010).

Almost surely, 2^13438987 is an apocalyptic number.

13438987 is a deficient number, since it is larger than the sum of its proper divisors (21053).

13438987 is an equidigital number, since it uses as much as digits as its factorization.

13438987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21052.

The product of its digits is 145152, while the sum is 43.

The square root of 13438987 is about 3665.9223941595. The cubic root of 13438987 is about 237.7509045548.

The spelling of 13438987 in words is "thirteen million, four hundred thirty-eight thousand, nine hundred eighty-seven".