16309933 has 4 divisors (see below), whose sum is σ = 16750780. Its totient is φ = 15869088.

The previous prime is 16309897. The next prime is 16309939. The reversal of 16309933 is 33990361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14424804 + 1885129 = 3798^2 + 1373^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16309933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16309939) 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, 220368 + ... + 220441.

It is an arithmetic number, because the mean of its divisors is an integer number (4187695).

Almost surely, 2^16309933 is an apocalyptic number.

It is an amenable number.

16309933 is a deficient number, since it is larger than the sum of its proper divisors (440847).

16309933 is an equidigital number, since it uses as much as digits as its factorization.

16309933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440846.

The product of its (nonzero) digits is 13122, while the sum is 34.

The square root of 16309933 is about 4038.5558062258. Note that the first 3 decimals coincide. The cubic root of 16309933 is about 253.6008621561.

The spelling of 16309933 in words is "sixteen million, three hundred nine thousand, nine hundred thirty-three".