43864397 has 2 divisors, whose sum is σ = 43864398. Its totient is φ = 43864396.

The previous prime is 43864393. The next prime is 43864417. The reversal of 43864397 is 79346834.

It is a happy number.

43864397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41396356 + 2468041 = 6434^2 + 1571^2 .

It is a cyclic number.

It is not a de Polignac number, because 43864397 - 2² = 43864393 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 (43864391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21932198 + 21932199.

It is an arithmetic number, because the mean of its divisors is an integer number (21932199).

Almost surely, 2^43864397 is an apocalyptic number.

It is an amenable number.

43864397 is a deficient number, since it is larger than the sum of its proper divisors (1).

43864397 is an equidigital number, since it uses as much as digits as its factorization.

43864397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 44.

The square root of 43864397 is about 6623.0202324921. The cubic root of 43864397 is about 352.6717892433.

The spelling of 43864397 in words is "forty-three million, eight hundred sixty-four thousand, three hundred ninety-seven".