216924945 has 16 divisors (see below), whose sum is σ = 347453952. Its totient is φ = 115568640.

The previous prime is 216924923. The next prime is 216924989. The reversal of 216924945 is 549429612.

It is not a de Polignac number, because 216924945 - 2¹² = 216920849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216924897 and 216924906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7569 + ... + 22161.

It is an arithmetic number, because the mean of its divisors is an integer number (21715872).

Almost surely, 2^216924945 is an apocalyptic number.

It is an amenable number.

216924945 is a deficient number, since it is larger than the sum of its proper divisors (130529007).

216924945 is a wasteful number, since it uses less digits than its factorization.

216924945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15592.

The product of its digits is 155520, while the sum is 42.

The square root of 216924945 is about 14728.3721096393. The cubic root of 216924945 is about 600.8552110000.

The spelling of 216924945 in words is "two hundred sixteen million, nine hundred twenty-four thousand, nine hundred forty-five".