43381937 has 2 divisors, whose sum is σ = 43381938. Its totient is φ = 43381936.

The previous prime is 43381907. The next prime is 43381957. The reversal of 43381937 is 73918334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37994896 + 5387041 = 6164^2 + 2321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43381937 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43381937.

It is not a weakly prime, because it can be changed into another prime (43381907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21690968 + 21690969.

It is an arithmetic number, because the mean of its divisors is an integer number (21690969).

Almost surely, 2^43381937 is an apocalyptic number.

It is an amenable number.

43381937 is a deficient number, since it is larger than the sum of its proper divisors (1).

43381937 is an equidigital number, since it uses as much as digits as its factorization.

43381937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 43381937 is about 6586.4965649425. The cubic root of 43381937 is about 351.3740192668.

The spelling of 43381937 in words is "forty-three million, three hundred eighty-one thousand, nine hundred thirty-seven".