16787399 has 4 divisors (see below), whose sum is σ = 17328960. Its totient is φ = 16245840.

The previous prime is 16787359. The next prime is 16787429. The reversal of 16787399 is 99378761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99378761 = 79 ⋅1257959.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16787399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16787359) 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, 270734 + ... + 270795.

It is an arithmetic number, because the mean of its divisors is an integer number (4332240).

Almost surely, 2^16787399 is an apocalyptic number.

16787399 is a deficient number, since it is larger than the sum of its proper divisors (541561).

16787399 is an equidigital number, since it uses as much as digits as its factorization.

16787399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541560.

The product of its digits is 571536, while the sum is 50.

The square root of 16787399 is about 4097.2428534320. The cubic root of 16787399 is about 256.0517829411.

The spelling of 16787399 in words is "sixteen million, seven hundred eighty-seven thousand, three hundred ninety-nine".