16400023 has 4 divisors (see below), whose sum is σ = 16929088. Its totient is φ = 15870960.

The previous prime is 16400017. The next prime is 16400047. The reversal of 16400023 is 32000461.

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 16400023 - 2⁹ = 16399511 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, 264486 + ... + 264547.

It is an arithmetic number, because the mean of its divisors is an integer number (4232272).

Almost surely, 2^16400023 is an apocalyptic number.

16400023 is a deficient number, since it is larger than the sum of its proper divisors (529065).

16400023 is an equidigital number, since it uses as much as digits as its factorization.

16400023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529064.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 16400023 is about 4049.6941859849. The cubic root of 16400023 is about 254.0669373255.

Adding to 16400023 its reverse (32000461), we get a palindrome (48400484).

The spelling of 16400023 in words is "sixteen million, four hundred thousand, twenty-three".