733840 has 20 divisors (see below), whose sum is σ = 1706364. Its totient is φ = 293504.

The previous prime is 733829. The next prime is 733841. The reversal of 733840 is 48337.

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 620944 = 336^2 + 788^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×733840² = 1077042291200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (733841) by changing a digit.

733840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507 + ... + 4666.

2⁷³³⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

733840 is an abundant number, since it is smaller than the sum of its proper divisors (972524).

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

733840 is a wasteful number, since it uses less digits than its factorization.

733840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186 (or 9180 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 733840 is about 856.6446170963. The cubic root of 733840 is about 90.1987377794.

The spelling of 733840 in words is "seven hundred thirty-three thousand, eight hundred forty".