40843909 has 2 divisors, whose sum is σ = 40843910. Its totient is φ = 40843908.

The previous prime is 40843889. The next prime is 40843921. The reversal of 40843909 is 90934804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 19775809 = 4590^2 + 4447^2 .

It is a cyclic number.

It is not a de Polignac number, because 40843909 - 2¹¹ = 40841861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40843949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20421954 + 20421955.

It is an arithmetic number, because the mean of its divisors is an integer number (20421955).

Almost surely, 2^40843909 is an apocalyptic number.

It is an amenable number.

40843909 is a deficient number, since it is larger than the sum of its proper divisors (1).

40843909 is an equidigital number, since it uses as much as digits as its factorization.

40843909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 40843909 is about 6390.9239551101. The cubic root of 40843909 is about 344.3835775633.

The spelling of 40843909 in words is "forty million, eight hundred forty-three thousand, nine hundred nine".