16424993 has 4 divisors (see below), whose sum is σ = 17688468. Its totient is φ = 15161520.

The previous prime is 16424981. The next prime is 16424999. The reversal of 16424993 is 39942461.

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 8427409 + 7997584 = 2903^2 + 2828^2 .

It is a cyclic number.

It is not a de Polignac number, because 16424993 - 2¹² = 16420897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16424999) 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, 631718 + ... + 631743.

It is an arithmetic number, because the mean of its divisors is an integer number (4422117).

Almost surely, 2^16424993 is an apocalyptic number.

16424993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16424993 is a deficient number, since it is larger than the sum of its proper divisors (1263475).

16424993 is a wasteful number, since it uses less digits than its factorization.

16424993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263474.

The product of its digits is 46656, while the sum is 38.

The square root of 16424993 is about 4052.7759622264. The cubic root of 16424993 is about 254.1958158930.

The spelling of 16424993 in words is "sixteen million, four hundred twenty-four thousand, nine hundred ninety-three".