16400811 has 8 divisors (see below), whose sum is σ = 24991744. Its totient is φ = 9371880.

The previous prime is 16400809. The next prime is 16400821. The reversal of 16400811 is 11800461.

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

It is not a de Polignac number, because 16400811 - 2¹ = 16400809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 780991 = 16400811 / (1 + 6 + 4 + 0 + 0 + 8 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16400821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390475 + ... + 390516.

It is an arithmetic number, because the mean of its divisors is an integer number (3123968).

Almost surely, 2^16400811 is an apocalyptic number.

16400811 is a deficient number, since it is larger than the sum of its proper divisors (8590933).

16400811 is an equidigital number, since it uses as much as digits as its factorization.

16400811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781001.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 16400811 is about 4049.7914761133. The cubic root of 16400811 is about 254.0710064568.

The spelling of 16400811 in words is "sixteen million, four hundred thousand, eight hundred eleven".