43402109 has 2 divisors, whose sum is σ = 43402110. Its totient is φ = 43402108.

The previous prime is 43402097. The next prime is 43402133. The reversal of 43402109 is 90120434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33605209 + 9796900 = 5797^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 43402109 - 2²⁴ = 26624893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43402159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21701054 + 21701055.

It is an arithmetic number, because the mean of its divisors is an integer number (21701055).

Almost surely, 2^43402109 is an apocalyptic number.

It is an amenable number.

43402109 is a deficient number, since it is larger than the sum of its proper divisors (1).

43402109 is an equidigital number, since it uses as much as digits as its factorization.

43402109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 43402109 is about 6588.0277018240. The cubic root of 43402109 is about 351.4284721789.

The spelling of 43402109 in words is "forty-three million, four hundred two thousand, one hundred nine".