16993399 has 2 divisors, whose sum is σ = 16993400. Its totient is φ = 16993398.

The previous prime is 16993381. The next prime is 16993439. The reversal of 16993399 is 99339961.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16993399 - 2¹⁵ = 16960631 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16993309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8496699 + 8496700.

It is an arithmetic number, because the mean of its divisors is an integer number (8496700).

Almost surely, 2^16993399 is an apocalyptic number.

16993399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16993399 is an equidigital number, since it uses as much as digits as its factorization.

16993399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 354294, while the sum is 49.

The square root of 16993399 is about 4122.3050590659. The cubic root of 16993399 is about 257.0948743068.

It can be divided in two parts, 1699 and 3399, that multiplied together give a triangular number (5774901 = T₃₃₉₈).

The spelling of 16993399 in words is "sixteen million, nine hundred ninety-three thousand, three hundred ninety-nine".