43722281 has 4 divisors (see below), whose sum is σ = 43736064. Its totient is φ = 43708500.

The previous prime is 43722209. The next prime is 43722293. The reversal of 43722281 is 18222734.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 43722281 - 2¹⁰ = 43721257 is a prime.

It is a super-2 number, since 2×43722281² = 3823275711685922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43721281) 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, 536 + ... + 9366.

It is an arithmetic number, because the mean of its divisors is an integer number (10934016).

Almost surely, 2^43722281 is an apocalyptic number.

It is an amenable number.

43722281 is a deficient number, since it is larger than the sum of its proper divisors (13783).

43722281 is an equidigital number, since it uses as much as digits as its factorization.

43722281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13782.

The product of its digits is 5376, while the sum is 29.

The square root of 43722281 is about 6612.2825862179. The cubic root of 43722281 is about 352.2905040915.

The spelling of 43722281 in words is "forty-three million, seven hundred twenty-two thousand, two hundred eighty-one".