16638140 has 24 divisors (see below), whose sum is σ = 35435232. Its totient is φ = 6560960.

The previous prime is 16638137. The next prime is 16638151. The reversal of 16638140 is 4183661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4439 + ... + 7278.

It is an arithmetic number, because the mean of its divisors is an integer number (1476468).

Almost surely, 2^16638140 is an apocalyptic number.

16638140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16638140 is an abundant number, since it is smaller than the sum of its proper divisors (18797092).

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

16638140 is a wasteful number, since it uses less digits than its factorization.

16638140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11797 (or 11795 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 16638140 is about 4078.9876194958. The cubic root of 16638140 is about 255.2906592137.

The spelling of 16638140 in words is "sixteen million, six hundred thirty-eight thousand, one hundred forty".