215364987 has 10 divisors (see below), whose sum is σ = 321718188. Its totient is φ = 143576604.

The previous prime is 215364979. The next prime is 215365013. The reversal of 215364987 is 789463512.

215364987 is a `hidden beast` number, since 2 + 153 + 6 + 498 + 7 = 666.

It is not a de Polignac number, because 215364987 - 2³ = 215364979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215364287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1329333 + ... + 1329494.

Almost surely, 2^215364987 is an apocalyptic number.

215364987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

215364987 is a deficient number, since it is larger than the sum of its proper divisors (106353201).

215364987 is an equidigital number, since it uses as much as digits as its factorization.

215364987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658839 (or 2658830 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 215364987 is about 14675.3189743869. The cubic root of 215364987 is about 599.4114478661.

The spelling of 215364987 in words is "two hundred fifteen million, three hundred sixty-four thousand, nine hundred eighty-seven".