43989857 has 2 divisors, whose sum is σ = 43989858. Its totient is φ = 43989856.

The previous prime is 43989851. The next prime is 43989859. The reversal of 43989857 is 75898934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 6031936 = 6161^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 43989857 - 2⁶ = 43989793 is a prime.

Together with 43989859, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43989799 and 43989808.

It is not a weakly prime, because it can be changed into another prime (43989851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21994928 + 21994929.

It is an arithmetic number, because the mean of its divisors is an integer number (21994929).

Almost surely, 2^43989857 is an apocalyptic number.

It is an amenable number.

43989857 is a deficient number, since it is larger than the sum of its proper divisors (1).

43989857 is an equidigital number, since it uses as much as digits as its factorization.

43989857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 53.

The square root of 43989857 is about 6632.4849792517. The cubic root of 43989857 is about 353.0077039303.

The spelling of 43989857 in words is "forty-three million, nine hundred eighty-nine thousand, eight hundred fifty-seven".