16800638 has 4 divisors (see below), whose sum is σ = 25200960. Its totient is φ = 8400318.

The previous prime is 16800631. The next prime is 16800653. The reversal of 16800638 is 83600861.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×16800638² = 564522874414088, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16800631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4200158 + ... + 4200161.

It is an arithmetic number, because the mean of its divisors is an integer number (6300240).

Almost surely, 2^16800638 is an apocalyptic number.

16800638 is a deficient number, since it is larger than the sum of its proper divisors (8400322).

16800638 is an equidigital number, since it uses as much as digits as its factorization.

16800638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400321.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 16800638 is about 4098.8581336758. The cubic root of 16800638 is about 256.1190750577.

The spelling of 16800638 in words is "sixteen million, eight hundred thousand, six hundred thirty-eight".