433640 has 32 divisors (see below), whose sum is σ = 1005480. Its totient is φ = 168192.

The previous prime is 433639. The next prime is 433651. The reversal of 433640 is 46334.

It is a happy number.

433640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 432964 + 676 = 658^2 + 26^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a plaindrome in base 13.

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 7 ways as a sum of consecutive naturals, for example, 1334 + ... + 1626.

2⁴³³⁶⁴⁰ is an apocalyptic number.

433640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 433640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (502740).

433640 is an abundant number, since it is smaller than the sum of its proper divisors (571840).

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

433640 is a wasteful number, since it uses less digits than its factorization.

433640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 433640 is about 658.5134774627. The cubic root of 433640 is about 75.6908028686.

Adding to 433640 its reverse (46334), we get a palindrome (479974).

It can be divided in two parts, 43 and 3640, that multiplied together give a triangular number (156520 = T₅₅₉).

The spelling of 433640 in words is "four hundred thirty-three thousand, six hundred forty".