16405012 has 12 divisors (see below), whose sum is σ = 30917236. Its totient is φ = 7571520.

The previous prime is 16405007. The next prime is 16405013. The reversal of 16405012 is 21050461.

It can be written as a sum of positive squares in 2 ways, for example, as 3111696 + 13293316 = 1764^2 + 3646^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16405013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157689 + ... + 157792.

Almost surely, 2^16405012 is an apocalyptic number.

It is an amenable number.

16405012 is a deficient number, since it is larger than the sum of its proper divisors (14512224).

16405012 is a wasteful number, since it uses less digits than its factorization.

16405012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315498 (or 315496 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 16405012 is about 4050.3101115841. The cubic root of 16405012 is about 254.0926976845.

Adding to 16405012 its reverse (21050461), we get a palindrome (37455473).

The spelling of 16405012 in words is "sixteen million, four hundred five thousand, twelve".