16403423 has 8 divisors (see below), whose sum is σ = 16812480. Its totient is φ = 15996960.

The previous prime is 16403417. The next prime is 16403437. The reversal of 16403423 is 32430461.

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 16403423 - 2¹⁴ = 16387039 is a prime.

It is a super-2 number, since 2×16403423² = 538144572233858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16403923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19373 + ... + 20201.

It is an arithmetic number, because the mean of its divisors is an integer number (2101560).

Almost surely, 2^16403423 is an apocalyptic number.

16403423 is a deficient number, since it is larger than the sum of its proper divisors (409057).

16403423 is an equidigital number, since it uses as much as digits as its factorization.

16403423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 16403423 is about 4050.1139490143. The cubic root of 16403423 is about 254.0844935590.

Adding to 16403423 its reverse (32430461), we get a palindrome (48833884).

The spelling of 16403423 in words is "sixteen million, four hundred three thousand, four hundred twenty-three".