43021240 has 16 divisors (see below), whose sum is σ = 96797880. Its totient is φ = 17208480.

The previous prime is 43021229. The next prime is 43021249. The reversal of 43021240 is 4212034.

It is a super-2 number, since 2×43021240² = 3701654182275200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43021249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537726 + ... + 537805.

Almost surely, 2^43021240 is an apocalyptic number.

43021240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43021240 is an abundant number, since it is smaller than the sum of its proper divisors (53776640).

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

43021240 is a wasteful number, since it uses less digits than its factorization.

43021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075542 (or 1075538 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 43021240 is about 6559.0578591746. The cubic root of 43021240 is about 350.3974804000.

Adding to 43021240 its reverse (4212034), we get a palindrome (47233274).

The spelling of 43021240 in words is "forty-three million, twenty-one thousand, two hundred forty".