43720281 has 12 divisors (see below), whose sum is σ = 68892720. Its totient is φ = 26497080.

The previous prime is 43720279. The next prime is 43720289. The reversal of 43720281 is 18202734.

It is not a de Polignac number, because 43720281 - 2¹ = 43720279 is a prime.

It is a super-2 number, since 2×43720281² = 3822925941437922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43720289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220711 + ... + 220908.

It is an arithmetic number, because the mean of its divisors is an integer number (5741060).

Almost surely, 2^43720281 is an apocalyptic number.

It is an amenable number.

43720281 is a deficient number, since it is larger than the sum of its proper divisors (25172439).

43720281 is a wasteful number, since it uses less digits than its factorization.

43720281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441636 (or 441633 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 43720281 is about 6612.1313507824. The cubic root of 43720281 is about 352.2851323700.

The spelling of 43720281 in words is "forty-three million, seven hundred twenty thousand, two hundred eighty-one".