40423609 has 2 divisors, whose sum is σ = 40423610. Its totient is φ = 40423608.

The previous prime is 40423601. The next prime is 40423633. The reversal of 40423609 is 90632404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23736384 + 16687225 = 4872^2 + 4085^2 .

It is a cyclic number.

It is not a de Polignac number, because 40423609 - 2³ = 40423601 is a prime.

It is not a weakly prime, because it can be changed into another prime (40423601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20211804 + 20211805.

It is an arithmetic number, because the mean of its divisors is an integer number (20211805).

Almost surely, 2^40423609 is an apocalyptic number.

It is an amenable number.

40423609 is a deficient number, since it is larger than the sum of its proper divisors (1).

40423609 is an equidigital number, since it uses as much as digits as its factorization.

40423609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 40423609 is about 6357.9563540496. The cubic root of 40423609 is about 343.1982211526.

The spelling of 40423609 in words is "forty million, four hundred twenty-three thousand, six hundred nine".