16400791 has 8 divisors (see below), whose sum is σ = 18273024. Its totient is φ = 14592120.

The previous prime is 16400789. The next prime is 16400809. The reversal of 16400791 is 19700461.

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 16400791 - 2¹ = 16400789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400711) 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, 15345 + ... + 16378.

It is an arithmetic number, because the mean of its divisors is an integer number (2284128).

Almost surely, 2^16400791 is an apocalyptic number.

16400791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16400791 is a deficient number, since it is larger than the sum of its proper divisors (1872233).

16400791 is a wasteful number, since it uses less digits than its factorization.

16400791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31781.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 16400791 is about 4049.7890068496. The cubic root of 16400791 is about 254.0709031810.

The spelling of 16400791 in words is "sixteen million, four hundred thousand, seven hundred ninety-one".