43285721 has 4 divisors (see below), whose sum is σ = 43306512. Its totient is φ = 43264932.

The previous prime is 43285717. The next prime is 43285727. The reversal of 43285721 is 12758234.

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.

It is a cyclic number.

It is not a de Polignac number, because 43285721 - 2² = 43285717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43285727) 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, 6875 + ... + 11568.

It is an arithmetic number, because the mean of its divisors is an integer number (10826628).

Almost surely, 2^43285721 is an apocalyptic number.

It is an amenable number.

43285721 is a deficient number, since it is larger than the sum of its proper divisors (20791).

43285721 is a wasteful number, since it uses less digits than its factorization.

43285721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20790.

The product of its digits is 13440, while the sum is 32.

The square root of 43285721 is about 6579.1884757924. The cubic root of 43285721 is about 351.1140583267.

The spelling of 43285721 in words is "forty-three million, two hundred eighty-five thousand, seven hundred twenty-one".