16440440 has 16 divisors (see below), whose sum is σ = 36991080. Its totient is φ = 6576160.

The previous prime is 16440407. The next prime is 16440481. The reversal of 16440440 is 4404461.

It is a super-3 number, since 3×16440440³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205466 + ... + 205545.

Almost surely, 2^16440440 is an apocalyptic number.

16440440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16440440 is an abundant number, since it is smaller than the sum of its proper divisors (20550640).

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

16440440 is a wasteful number, since it uses less digits than its factorization.

16440440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411022 (or 411018 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 16440440 is about 4054.6812451782. The cubic root of 16440440 is about 254.2754776721.

It can be divided in two parts, 164 and 40440, that added together give a palindrome (40604).

The spelling of 16440440 in words is "sixteen million, four hundred forty thousand, four hundred forty".