43594381 has 2 divisors, whose sum is σ = 43594382. Its totient is φ = 43594380.

The previous prime is 43594373. The next prime is 43594391. The reversal of 43594381 is 18349534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41538025 + 2056356 = 6445^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 43594381 - 2³ = 43594373 is a prime.

It is a super-2 number, since 2×43594381² = 3800940109546322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43594381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43594391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21797190 + 21797191.

It is an arithmetic number, because the mean of its divisors is an integer number (21797191).

Almost surely, 2^43594381 is an apocalyptic number.

It is an amenable number.

43594381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43594381 is an equidigital number, since it uses as much as digits as its factorization.

43594381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 43594381 is about 6602.6041074715. The cubic root of 43594381 is about 351.9466522329.

The spelling of 43594381 in words is "forty-three million, five hundred ninety-four thousand, three hundred eighty-one".