16439393 has 4 divisors (see below), whose sum is σ = 16969728. Its totient is φ = 15909060.

The previous prime is 16439387. The next prime is 16439399. The reversal of 16439393 is 39393461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39393461 = 43 ⋅916127.

It is an interprime number because it is at equal distance from previous prime (16439387) and next prime (16439399).

It is a cyclic number.

It is not a de Polignac number, because 16439393 - 2⁴ = 16439377 is a prime.

It is a Duffinian number.

16439393 is a modest number, since divided by 9393 gives 1643 as remainder.

It is not an unprimeable number, because it can be changed into a prime (16439399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265121 + ... + 265182.

It is an arithmetic number, because the mean of its divisors is an integer number (4242432).

Almost surely, 2^16439393 is an apocalyptic number.

It is an amenable number.

16439393 is a deficient number, since it is larger than the sum of its proper divisors (530335).

16439393 is an equidigital number, since it uses as much as digits as its factorization.

16439393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530334.

The product of its digits is 52488, while the sum is 38.

The square root of 16439393 is about 4054.5521330968. The cubic root of 16439393 is about 254.2700797615.

The spelling of 16439393 in words is "sixteen million, four hundred thirty-nine thousand, three hundred ninety-three".