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43909189 is a prime number
BaseRepresentation
bin1010011110000…
…0000001000101
310001121211002021
42213200001011
542220043224
64205043141
71042136062
oct247400105
9101554067
1043909189
1122870695
12128564b1
139134c8c
145b8dc69
153cc51e4
hex29e0045

43909189 has 2 divisors, whose sum is σ = 43909190. Its totient is φ = 43909188.

The previous prime is 43909111. The next prime is 43909193. The reversal of 43909189 is 98190934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27772900 + 16136289 = 5270^2 + 4017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-43909189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43909199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21954594 + 21954595.

It is an arithmetic number, because the mean of its divisors is an integer number (21954595).

Almost surely, 243909189 is an apocalyptic number.

It is an amenable number.

43909189 is a deficient number, since it is larger than the sum of its proper divisors (1).

43909189 is an equidigital number, since it uses as much as digits as its factorization.

43909189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 43909189 is about 6626.4009084872. The cubic root of 43909189 is about 352.7917916593.

The spelling of 43909189 in words is "forty-three million, nine hundred nine thousand, one hundred eighty-nine".