16321730 has 8 divisors (see below), whose sum is σ = 29379132. Its totient is φ = 6528688.

The previous prime is 16321729. The next prime is 16321733. The reversal of 16321730 is 3712361.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14969161 + 1352569 = 3869^2 + 1163^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 16321696 and 16321705.

It is not an unprimeable number, because it can be changed into a prime (16321733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816077 + ... + 816096.

Almost surely, 2^16321730 is an apocalyptic number.

16321730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16321730 is a deficient number, since it is larger than the sum of its proper divisors (13057402).

16321730 is a wasteful number, since it uses less digits than its factorization.

16321730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632180.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 16321730 is about 4040.0160890769. The cubic root of 16321730 is about 253.6619907202.

The spelling of 16321730 in words is "sixteen million, three hundred twenty-one thousand, seven hundred thirty".