43490857 has 2 divisors, whose sum is σ = 43490858. Its totient is φ = 43490856.

The previous prime is 43490851. The next prime is 43490911. The reversal of 43490857 is 75809434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41267776 + 2223081 = 6424^2 + 1491^2 .

It is a cyclic number.

It is not a de Polignac number, because 43490857 - 2¹⁵ = 43458089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43490851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21745428 + 21745429.

It is an arithmetic number, because the mean of its divisors is an integer number (21745429).

Almost surely, 2^43490857 is an apocalyptic number.

It is an amenable number.

43490857 is a deficient number, since it is larger than the sum of its proper divisors (1).

43490857 is an equidigital number, since it uses as much as digits as its factorization.

43490857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 43490857 is about 6594.7598136702. The cubic root of 43490857 is about 351.6678410399.

The spelling of 43490857 in words is "forty-three million, four hundred ninety thousand, eight hundred fifty-seven".