721000043 has 8 divisors (see below), whose sum is σ = 724437168. Its totient is φ = 717570144.

The previous prime is 721000009. The next prime is 721000051. The reversal of 721000043 is 340000127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721000043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720999985 and 721000030.

It is not an unprimeable number, because it can be changed into a prime (721030043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326180 + ... + 328382.

It is an arithmetic number, because the mean of its divisors is an integer number (90554646).

Almost surely, 2^721000043 is an apocalyptic number.

721000043 is a deficient number, since it is larger than the sum of its proper divisors (3437125).

721000043 is a wasteful number, since it uses less digits than its factorization.

721000043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 721000043 is about 26851.4439648969. The cubic root of 721000043 is about 896.6957200655.

The spelling of 721000043 in words is "seven hundred twenty-one million, forty-three", and thus it is an aban number.