16865140 has 12 divisors (see below), whose sum is σ = 35416836. Its totient is φ = 6746048.

The previous prime is 16865129. The next prime is 16865171. The reversal of 16865140 is 4156861.

It can be written as a sum of positive squares in 2 ways, for example, as 4502884 + 12362256 = 2122^2 + 3516^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 421609 + ... + 421648.

It is an arithmetic number, because the mean of its divisors is an integer number (2951403).

Almost surely, 2^16865140 is an apocalyptic number.

16865140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16865140 is an abundant number, since it is smaller than the sum of its proper divisors (18551696).

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

16865140 is a wasteful number, since it uses less digits than its factorization.

16865140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843266 (or 843264 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 16865140 is about 4106.7188849494. The cubic root of 16865140 is about 256.4464256379.

The spelling of 16865140 in words is "sixteen million, eight hundred sixty-five thousand, one hundred forty".