16623869 has 4 divisors (see below), whose sum is σ = 16858080. Its totient is φ = 16389660.

The previous prime is 16623857. The next prime is 16623907. The reversal of 16623869 is 96832661.

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: 96832661 = 1021 ⋅94841.

It is a cyclic number.

It is not a de Polignac number, because 16623869 - 2¹² = 16619773 is a prime.

It is a super-2 number, since 2×16623869² = 552706041058322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116999 + ... + 117140.

It is an arithmetic number, because the mean of its divisors is an integer number (4214520).

Almost surely, 2^16623869 is an apocalyptic number.

It is an amenable number.

16623869 is a deficient number, since it is larger than the sum of its proper divisors (234211).

16623869 is an equidigital number, since it uses as much as digits as its factorization.

16623869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234210.

The product of its digits is 93312, while the sum is 41.

The square root of 16623869 is about 4077.2379130975. The cubic root of 16623869 is about 255.2176483456.

The spelling of 16623869 in words is "sixteen million, six hundred twenty-three thousand, eight hundred sixty-nine".