43939397 has 2 divisors, whose sum is σ = 43939398. Its totient is φ = 43939396.

The previous prime is 43939393. The next prime is 43939403. The reversal of 43939397 is 79393934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43375396 + 564001 = 6586^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 43939397 - 2² = 43939393 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43939391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21969698 + 21969699.

It is an arithmetic number, because the mean of its divisors is an integer number (21969699).

Almost surely, 2^43939397 is an apocalyptic number.

It is an amenable number.

43939397 is a deficient number, since it is larger than the sum of its proper divisors (1).

43939397 is an equidigital number, since it uses as much as digits as its factorization.

43939397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551124, while the sum is 47.

The square root of 43939397 is about 6628.6798836571. The cubic root of 43939397 is about 352.8726759549.

The spelling of 43939397 in words is "forty-three million, nine hundred thirty-nine thousand, three hundred ninety-seven".