43873813 has 4 divisors (see below), whose sum is σ = 44943948. Its totient is φ = 42803680.

The previous prime is 43873789. The next prime is 43873829. The reversal of 43873813 is 31837834.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4848804 + 39025009 = 2202^2 + 6247^2 .

It is a cyclic number.

It is not a de Polignac number, because 43873813 - 2¹³ = 43865621 is a prime.

It is a super-2 number, since 2×43873813² = 3849822934317938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43873873) 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, 535006 + ... + 535087.

It is an arithmetic number, because the mean of its divisors is an integer number (11235987).

Almost surely, 2^43873813 is an apocalyptic number.

It is an amenable number.

43873813 is a deficient number, since it is larger than the sum of its proper divisors (1070135).

43873813 is a wasteful number, since it uses less digits than its factorization.

43873813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070134.

The product of its digits is 48384, while the sum is 37.

The square root of 43873813 is about 6623.7310482839. The cubic root of 43873813 is about 352.6970224636.

The spelling of 43873813 in words is "forty-three million, eight hundred seventy-three thousand, eight hundred thirteen".