43879861 has 2 divisors, whose sum is σ = 43879862. Its totient is φ = 43879860.

The previous prime is 43879853. The next prime is 43879877. The reversal of 43879861 is 16897834.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32421636 + 11458225 = 5694^2 + 3385^2 .

It is a cyclic number.

It is not a de Polignac number, because 43879861 - 2³ = 43879853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43879831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21939930 + 21939931.

It is an arithmetic number, because the mean of its divisors is an integer number (21939931).

Almost surely, 2^43879861 is an apocalyptic number.

It is an amenable number.

43879861 is a deficient number, since it is larger than the sum of its proper divisors (1).

43879861 is an equidigital number, since it uses as much as digits as its factorization.

43879861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 43879861 is about 6624.1875728273. The cubic root of 43879861 is about 352.7132281334.

The spelling of 43879861 in words is "forty-three million, eight hundred seventy-nine thousand, eight hundred sixty-one".