16505240 has 32 divisors (see below), whose sum is σ = 37260000. Its totient is φ = 6580224.

The previous prime is 16505213. The next prime is 16505261. The reversal of 16505240 is 4250561.

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, 17501 + ... + 18419.

It is an arithmetic number, because the mean of its divisors is an integer number (1164375).

Almost surely, 2^16505240 is an apocalyptic number.

16505240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16505240 is an abundant number, since it is smaller than the sum of its proper divisors (20754760).

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

16505240 is a wasteful number, since it uses less digits than its factorization.

16505240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 16505240 is about 4062.6641505298. The cubic root of 16505240 is about 254.6091153390.

The spelling of 16505240 in words is "sixteen million, five hundred five thousand, two hundred forty".