16662399 has 8 divisors (see below), whose sum is σ = 23925552. Its totient is φ = 10253760.

The previous prime is 16662343. The next prime is 16662403. The reversal of 16662399 is 99326661.

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

It is not a de Polignac number, because 16662399 - 2⁷ = 16662271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16662399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16662319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213582 + ... + 213659.

It is an arithmetic number, because the mean of its divisors is an integer number (2990694).

Almost surely, 2^16662399 is an apocalyptic number.

16662399 is a deficient number, since it is larger than the sum of its proper divisors (7263153).

16662399 is a wasteful number, since it uses less digits than its factorization.

16662399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427257.

The product of its digits is 104976, while the sum is 42.

The square root of 16662399 is about 4081.9601908887. The cubic root of 16662399 is about 255.4146732485.

The spelling of 16662399 in words is "sixteen million, six hundred sixty-two thousand, three hundred ninety-nine".