16099812 has 18 divisors (see below), whose sum is σ = 40696838. Its totient is φ = 5366592.

The previous prime is 16099807. The next prime is 16099823. The reversal of 16099812 is 21899061.

It can be written as a sum of positive squares in only one way, i.e., 11329956 + 4769856 = 3366^2 + 2184^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 447217 = 16099812 / (1 + 6 + 0 + 9 + 9 + 8 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223573 + ... + 223644.

Almost surely, 2^16099812 is an apocalyptic number.

16099812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16099812 is an abundant number, since it is smaller than the sum of its proper divisors (24597026).

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

16099812 is a wasteful number, since it uses less digits than its factorization.

16099812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447227 (or 447222 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 16099812 is about 4012.4571025744. The cubic root of 16099812 is about 252.5071043323.

The spelling of 16099812 in words is "sixteen million, ninety-nine thousand, eight hundred twelve".