16423691 has 4 divisors (see below), whose sum is σ = 16431984. Its totient is φ = 16415400.

The previous prime is 16423681. The next prime is 16423699. The reversal of 16423691 is 19632461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16423691 - 2¹⁸ = 16161547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16423699) 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, 761 + ... + 5781.

It is an arithmetic number, because the mean of its divisors is an integer number (4107996).

Almost surely, 2^16423691 is an apocalyptic number.

16423691 is a deficient number, since it is larger than the sum of its proper divisors (8293).

16423691 is an equidigital number, since it uses as much as digits as its factorization.

16423691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8292.

The product of its digits is 7776, while the sum is 32.

The square root of 16423691 is about 4052.6153284021. The cubic root of 16423691 is about 254.1890990622.

The spelling of 16423691 in words is "sixteen million, four hundred twenty-three thousand, six hundred ninety-one".