16165840 has 40 divisors (see below), whose sum is σ = 37754280. Its totient is φ = 6437376.

The previous prime is 16165837. The next prime is 16165841. The reversal of 16165840 is 4856161.

It can be written as a sum of positive squares in 4 ways, for example, as 4822416 + 11343424 = 2196^2 + 3368^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×16165840² = 522668765811200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16165841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31506 + ... + 32014.

It is an arithmetic number, because the mean of its divisors is an integer number (943857).

Almost surely, 2^16165840 is an apocalyptic number.

16165840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16165840 is an abundant number, since it is smaller than the sum of its proper divisors (21588440).

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

16165840 is a wasteful number, since it uses less digits than its factorization.

16165840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 913 counting only the distinct ones).

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

The square root of 16165840 is about 4020.6765599834. The cubic root of 16165840 is about 252.8518246846.

The spelling of 16165840 in words is "sixteen million, one hundred sixty-five thousand, eight hundred forty".