16404012 has 48 divisors (see below), whose sum is σ = 43182720. Its totient is φ = 5384016.

The previous prime is 16404007. The next prime is 16404041. The reversal of 16404012 is 21040461.

It is a super-2 number, since 2×16404012² = 538183219392288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6103 + ... + 8369.

It is an arithmetic number, because the mean of its divisors is an integer number (899640).

Almost surely, 2^16404012 is an apocalyptic number.

16404012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16404012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21591360).

16404012 is an abundant number, since it is smaller than the sum of its proper divisors (26778708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16404012 is a wasteful number, since it uses less digits than its factorization.

16404012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347 (or 2339 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 16404012 is about 4050.1866623651. The cubic root of 16404012 is about 254.0875346717.

Adding to 16404012 its reverse (21040461), we get a palindrome (37444473).

The spelling of 16404012 in words is "sixteen million, four hundred four thousand, twelve".