165435440 has 40 divisors (see below), whose sum is σ = 388620960. Its totient is φ = 65488896.

The previous prime is 165435421. The next prime is 165435443. The reversal of 165435440 is 44534561.

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

It is a junction number, because it is equal to n+sod(n) for n = 165435397 and 165435406.

It is not an unprimeable number, because it can be changed into a prime (165435443) 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, 2900 + ... + 18419.

It is an arithmetic number, because the mean of its divisors is an integer number (9715524).

Almost surely, 2^165435440 is an apocalyptic number.

165435440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165435440 is an abundant number, since it is smaller than the sum of its proper divisors (223185520).

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

165435440 is a wasteful number, since it uses less digits than its factorization.

165435440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21429 (or 21423 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 165435440 is about 12862.1708898615. The cubic root of 165435440 is about 548.9627171229.

The spelling of 165435440 in words is "one hundred sixty-five million, four hundred thirty-five thousand, four hundred forty".