16400523 has 8 divisors (see below), whose sum is σ = 21964608. Its totient is φ = 10885064.

The previous prime is 16400513. The next prime is 16400539. The reversal of 16400523 is 32500461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16400523 - 2⁶ = 16400459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16400523.

It is not an unprimeable number, because it can be changed into a prime (16400513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11361 + ... + 12722.

It is an arithmetic number, because the mean of its divisors is an integer number (2745576).

Almost surely, 2^16400523 is an apocalyptic number.

16400523 is a deficient number, since it is larger than the sum of its proper divisors (5564085).

16400523 is a wasteful number, since it uses less digits than its factorization.

16400523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24313.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 16400523 is about 4049.7559185709. The cubic root of 16400523 is about 254.0695192767.

Adding to 16400523 its reverse (32500461), we get a palindrome (48900984).

The spelling of 16400523 in words is "sixteen million, four hundred thousand, five hundred twenty-three".