165889840 has 40 divisors (see below), whose sum is σ = 386256528. Its totient is φ = 66259200.

The previous prime is 165889819. The next prime is 165889849. The reversal of 165889840 is 48988561.

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

It is not an unprimeable number, because it can be changed into a prime (165889849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83094 + ... + 85066.

Almost surely, 2^165889840 is an apocalyptic number.

165889840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165889840 is an abundant number, since it is smaller than the sum of its proper divisors (220366688).

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

165889840 is a wasteful number, since it uses less digits than its factorization.

165889840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037 (or 3031 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 165889840 is about 12879.8229801500. The cubic root of 165889840 is about 549.4648679326.

The spelling of 165889840 in words is "one hundred sixty-five million, eight hundred eighty-nine thousand, eight hundred forty".