16215887 has 2 divisors, whose sum is σ = 16215888. Its totient is φ = 16215886.

The previous prime is 16215863. The next prime is 16215917. The reversal of 16215887 is 78851261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16215887 - 2⁸ = 16215631 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 16215887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16215847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8107943 + 8107944.

It is an arithmetic number, because the mean of its divisors is an integer number (8107944).

Almost surely, 2^16215887 is an apocalyptic number.

16215887 is a deficient number, since it is larger than the sum of its proper divisors (1).

16215887 is an equidigital number, since it uses as much as digits as its factorization.

16215887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 16215887 is about 4026.8954543171. The cubic root of 16215887 is about 253.1124862380.

The spelling of 16215887 in words is "sixteen million, two hundred fifteen thousand, eight hundred eighty-seven".