16404887 has 4 divisors (see below), whose sum is σ = 16786440. Its totient is φ = 16023336.

The previous prime is 16404863. The next prime is 16404937. The reversal of 16404887 is 78840461.

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 16404887 - 2¹⁸ = 16142743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16404887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16404287) 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, 190712 + ... + 190797.

It is an arithmetic number, because the mean of its divisors is an integer number (4196610).

Almost surely, 2^16404887 is an apocalyptic number.

16404887 is a deficient number, since it is larger than the sum of its proper divisors (381553).

16404887 is an equidigital number, since it uses as much as digits as its factorization.

16404887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381552.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 16404887 is about 4050.2946806374. The cubic root of 16404887 is about 254.0920523194.

The spelling of 16404887 in words is "sixteen million, four hundred four thousand, eight hundred eighty-seven".