43273981 has 8 divisors (see below), whose sum is σ = 44605440. Its totient is φ = 41959728.

The previous prime is 43273969. The next prime is 43274029. The reversal of 43273981 is 18937234.

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

It is a cyclic number.

It is not a de Polignac number, because 43273981 - 2¹⁵ = 43241213 is a prime.

It is a super-3 number, since 3×43273981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43273981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43273961) 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, 900 + ... + 9346.

It is an arithmetic number, because the mean of its divisors is an integer number (5575680).

Almost surely, 2^43273981 is an apocalyptic number.

It is an amenable number.

43273981 is a deficient number, since it is larger than the sum of its proper divisors (1331459).

43273981 is a wasteful number, since it uses less digits than its factorization.

43273981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8603.

The product of its digits is 36288, while the sum is 37.

The square root of 43273981 is about 6578.2962079858. The cubic root of 43273981 is about 351.0823122784.

The spelling of 43273981 in words is "forty-three million, two hundred seventy-three thousand, nine hundred eighty-one".