16400063 has 4 divisors (see below), whose sum is σ = 16504680. Its totient is φ = 16295448.

The previous prime is 16400047. The next prime is 16400093. The reversal of 16400063 is 36000461.

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

It is a cyclic number.

It is not a de Polignac number, because 16400063 - 2⁴ = 16400047 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 (16400093) 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, 52073 + ... + 52386.

It is an arithmetic number, because the mean of its divisors is an integer number (4126170).

Almost surely, 2^16400063 is an apocalyptic number.

16400063 is a deficient number, since it is larger than the sum of its proper divisors (104617).

16400063 is a wasteful number, since it uses less digits than its factorization.

16400063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104616.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 16400063 is about 4049.6991246264. The cubic root of 16400063 is about 254.0671438835.

The spelling of 16400063 in words is "sixteen million, four hundred thousand, sixty-three".