216387249 has 16 divisors (see below), whose sum is σ = 311375232. Its totient is φ = 132876288.

The previous prime is 216387221. The next prime is 216387251. The reversal of 216387249 is 942783612.

It is not a de Polignac number, because 216387249 - 2⁷ = 216387121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216387249.

It is not an unprimeable number, because it can be changed into a prime (216387049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13297 + ... + 24689.

It is an arithmetic number, because the mean of its divisors is an integer number (19460952).

Almost surely, 2^216387249 is an apocalyptic number.

It is an amenable number.

216387249 is a deficient number, since it is larger than the sum of its proper divisors (94987983).

216387249 is a wasteful number, since it uses less digits than its factorization.

216387249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11896.

The product of its digits is 145152, while the sum is 42.

The square root of 216387249 is about 14710.1070356405. The cubic root of 216387249 is about 600.3583498220.

The spelling of 216387249 in words is "two hundred sixteen million, three hundred eighty-seven thousand, two hundred forty-nine".