16404142 has 4 divisors (see below), whose sum is σ = 24606216. Its totient is φ = 8202070.

The previous prime is 16404139. The next prime is 16404161. The reversal of 16404142 is 24140461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24140461 = 2777 ⋅8693.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4101034 + ... + 4101037.

It is an arithmetic number, because the mean of its divisors is an integer number (6151554).

Almost surely, 2^16404142 is an apocalyptic number.

16404142 is a deficient number, since it is larger than the sum of its proper divisors (8202074).

16404142 is an equidigital number, since it uses as much as digits as its factorization.

16404142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8202073.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 16404142 is about 4050.2027109763. The cubic root of 16404142 is about 254.0882058753.

The spelling of 16404142 in words is "sixteen million, four hundred four thousand, one hundred forty-two".