216738249 has 32 divisors (see below), whose sum is σ = 357202944. Its totient is φ = 113832000.

The previous prime is 216738239. The next prime is 216738281. The reversal of 216738249 is 942837612.

It is not a de Polignac number, because 216738249 - 2⁵ = 216738217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216738249.

It is not an unprimeable number, because it can be changed into a prime (216738209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66942 + ... + 70104.

It is an arithmetic number, because the mean of its divisors is an integer number (11162592).

Almost surely, 2^216738249 is an apocalyptic number.

It is an amenable number.

216738249 is a deficient number, since it is larger than the sum of its proper divisors (140464695).

216738249 is a wasteful number, since it uses less digits than its factorization.

216738249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437.

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

The square root of 216738249 is about 14722.0327740431. The cubic root of 216738249 is about 600.6827865983.

The spelling of 216738249 in words is "two hundred sixteen million, seven hundred thirty-eight thousand, two hundred forty-nine".