43790721 has 16 divisors (see below), whose sum is σ = 64580544. Its totient is φ = 26218944.

The previous prime is 43790711. The next prime is 43790723. The reversal of 43790721 is 12709734.

It is not a de Polignac number, because 43790721 - 2¹⁵ = 43757953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43790723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13731 + ... + 16616.

It is an arithmetic number, because the mean of its divisors is an integer number (4036284).

Almost surely, 2^43790721 is an apocalyptic number.

It is an amenable number.

43790721 is a deficient number, since it is larger than the sum of its proper divisors (20789823).

43790721 is a wasteful number, since it uses less digits than its factorization.

43790721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30400.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 43790721 is about 6617.4557799807. The cubic root of 43790721 is about 352.4742257700.

The spelling of 43790721 in words is "forty-three million, seven hundred ninety thousand, seven hundred twenty-one".