13921187 has 8 divisors (see below), whose sum is σ = 16601856. Its totient is φ = 11413512.

The previous prime is 13921163. The next prime is 13921211. The reversal of 13921187 is 78112931.

It is an interprime number because it is at equal distance from previous prime (13921163) and next prime (13921211).

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

It is a cyclic number.

It is not a de Polignac number, because 13921187 - 2⁶ = 13921123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13920187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43073 + ... + 43394.

It is an arithmetic number, because the mean of its divisors is an integer number (2075232).

Almost surely, 2^13921187 is an apocalyptic number.

13921187 is a deficient number, since it is larger than the sum of its proper divisors (2680669).

13921187 is an equidigital number, since it uses as much as digits as its factorization.

13921187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86497.

The product of its digits is 3024, while the sum is 32.

The square root of 13921187 is about 3731.1106925418. The cubic root of 13921187 is about 240.5611118855.

The spelling of 13921187 in words is "thirteen million, nine hundred twenty-one thousand, one hundred eighty-seven".