16218946 has 8 divisors (see below), whose sum is σ = 25167420. Its totient is φ = 7829808.

The previous prime is 16218941. The next prime is 16218949. The reversal of 16218946 is 64981261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15093225 + 1125721 = 3885^2 + 1061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (16218941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139761 + ... + 139876.

Almost surely, 2^16218946 is an apocalyptic number.

16218946 is a deficient number, since it is larger than the sum of its proper divisors (8948474).

16218946 is a wasteful number, since it uses less digits than its factorization.

16218946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279668.

The product of its digits is 20736, while the sum is 37.

The square root of 16218946 is about 4027.2752575408. The cubic root of 16218946 is about 253.1284011330.

The spelling of 16218946 in words is "sixteen million, two hundred eighteen thousand, nine hundred forty-six".