16999720 has 32 divisors (see below), whose sum is σ = 38598120. Its totient is φ = 6737920.

The previous prime is 16999681. The next prime is 16999733. The reversal of 16999720 is 2799961.

It can be written as a sum of positive squares in 4 ways, for example, as 7963684 + 9036036 = 2822^2 + 3006^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2640 + ... + 6400.

Almost surely, 2^16999720 is an apocalyptic number.

16999720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16999720 is an abundant number, since it is smaller than the sum of its proper divisors (21598400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16999720 is a wasteful number, since it uses less digits than its factorization.

16999720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3885 (or 3881 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 16999720 is about 4123.0716704903. The cubic root of 16999720 is about 257.1267473741.

The spelling of 16999720 in words is "sixteen million, nine hundred ninety-nine thousand, seven hundred twenty".