16400743 has 4 divisors (see below), whose sum is σ = 17263960. Its totient is φ = 15537528.

The previous prime is 16400737. The next prime is 16400789. The reversal of 16400743 is 34700461.

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 16400743 - 2⁵ = 16400711 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 (16400723) 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 3 ways as a sum of consecutive naturals, for example, 431580 + ... + 431617.

It is an arithmetic number, because the mean of its divisors is an integer number (4315990).

Almost surely, 2^16400743 is an apocalyptic number.

16400743 is a deficient number, since it is larger than the sum of its proper divisors (863217).

16400743 is an equidigital number, since it uses as much as digits as its factorization.

16400743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863216.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 16400743 is about 4049.7830806106. The cubic root of 16400743 is about 254.0706553186.

The spelling of 16400743 in words is "sixteen million, four hundred thousand, seven hundred forty-three".