14215987 has 2 divisors, whose sum is σ = 14215988. Its totient is φ = 14215986.

The previous prime is 14215973. The next prime is 14215997. The reversal of 14215987 is 78951241.

It is a strong prime.

It is an emirp because it is prime and its reverse (78951241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14215987 is a prime.

It is not a weakly prime, because it can be changed into another prime (14215937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7107993 + 7107994.

It is an arithmetic number, because the mean of its divisors is an integer number (7107994).

Almost surely, 2^14215987 is an apocalyptic number.

14215987 is a deficient number, since it is larger than the sum of its proper divisors (1).

14215987 is an equidigital number, since it uses as much as digits as its factorization.

14215987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 14215987 is about 3770.4093942170. The cubic root of 14215987 is about 242.2473338145.

It can be divided in two parts, 142 and 15987, that added together give a square (16129 = 127²).

The spelling of 14215987 in words is "fourteen million, two hundred fifteen thousand, nine hundred eighty-seven".