16405136 has 40 divisors (see below), whose sum is σ = 36720864. Its totient is φ = 7016960.

The previous prime is 16405121. The next prime is 16405139. The reversal of 16405136 is 63150461.

It is not an unprimeable number, because it can be changed into a prime (16405139) 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 7 ways as a sum of consecutive naturals, for example, 251 + ... + 5733.

Almost surely, 2^16405136 is an apocalyptic number.

16405136 is a gapful number since it is divisible by the number (16) 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 16405136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18360432).

16405136 is an abundant number, since it is smaller than the sum of its proper divisors (20315728).

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

16405136 is a wasteful number, since it uses less digits than its factorization.

16405136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519 (or 5513 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 16405136 is about 4050.3254190250. The cubic root of 16405136 is about 254.0933378835.

Adding to 16405136 its reverse (63150461), we get a palindrome (79555597).

It can be divided in two parts, 1640 and 5136, that added together give a palindrome (6776).

The spelling of 16405136 in words is "sixteen million, four hundred five thousand, one hundred thirty-six".