43239040 has 64 divisors (see below), whose sum is σ = 111341160. Its totient is φ = 15962112.

The previous prime is 43239023. The next prime is 43239067. The reversal of 43239040 is 4093234.

It can be written as a sum of positive squares in 4 ways, for example, as 26132544 + 17106496 = 5112^2 + 4136^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×43239040² = 3739229160243200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43238996 and 43239014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5722 + ... + 10918.

Almost surely, 2^43239040 is an apocalyptic number.

43239040 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 43239040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55670580).

43239040 is an abundant number, since it is smaller than the sum of its proper divisors (68102120).

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

43239040 is a wasteful number, since it uses less digits than its factorization.

43239040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5229 (or 5217 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 43239040 is about 6575.6398928165. The cubic root of 43239040 is about 350.9877945881.

The spelling of 43239040 in words is "forty-three million, two hundred thirty-nine thousand, forty".