43997189 has 2 divisors, whose sum is σ = 43997190. Its totient is φ = 43997188.

The previous prime is 43997159. The next prime is 43997197. The reversal of 43997189 is 98179934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37920964 + 6076225 = 6158^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 43997189 - 2⁸ = 43996933 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 (43997119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21998594 + 21998595.

It is an arithmetic number, because the mean of its divisors is an integer number (21998595).

Almost surely, 2^43997189 is an apocalyptic number.

It is an amenable number.

43997189 is a deficient number, since it is larger than the sum of its proper divisors (1).

43997189 is an equidigital number, since it uses as much as digits as its factorization.

43997189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 43997189 is about 6633.0376902291. The cubic root of 43997189 is about 353.0273153353.

The spelling of 43997189 in words is "forty-three million, nine hundred ninety-seven thousand, one hundred eighty-nine".