233640440 has 64 divisors (see below), whose sum is σ = 598440960. Its totient is φ = 81262720.

The previous prime is 233640439. The next prime is 233640467. The reversal of 233640440 is 44046332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1424 + ... + 21663.

It is an arithmetic number, because the mean of its divisors is an integer number (9350640).

Almost surely, 2^233640440 is an apocalyptic number.

233640440 is a gapful number since it is divisible by the number (20) 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 233640440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299220480).

233640440 is an abundant number, since it is smaller than the sum of its proper divisors (364800520).

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

233640440 is a wasteful number, since it uses less digits than its factorization.

233640440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23132 (or 23128 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 233640440 is about 15285.3014363473. The cubic root of 233640440 is about 615.9082268971.

Adding to 233640440 its reverse (44046332), we get a palindrome (277686772).

It can be divided in two parts, 23 and 3640440, that added together give a palindrome (3640463).

The spelling of 233640440 in words is "two hundred thirty-three million, six hundred forty thousand, four hundred forty".