16640240 has 20 divisors (see below), whose sum is σ = 38688744. Its totient is φ = 6656064.

The previous prime is 16640233. The next prime is 16640243. The reversal of 16640240 is 4204661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640243) 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, 103922 + ... + 104081.

Almost surely, 2^16640240 is an apocalyptic number.

16640240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16640240 is an abundant number, since it is smaller than the sum of its proper divisors (22048504).

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

16640240 is a wasteful number, since it uses less digits than its factorization.

16640240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208016 (or 208010 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 16640240 is about 4079.2450281884. The cubic root of 16640240 is about 255.3013993532.

The spelling of 16640240 in words is "sixteen million, six hundred forty thousand, two hundred forty".