40446409 has 2 divisors, whose sum is σ = 40446410. Its totient is φ = 40446408.

The previous prime is 40446361. The next prime is 40446433. The reversal of 40446409 is 90464404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20839225 + 19607184 = 4565^2 + 4428^2 .

It is a cyclic number.

It is not a de Polignac number, because 40446409 - 2¹¹ = 40444361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40446449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20223204 + 20223205.

It is an arithmetic number, because the mean of its divisors is an integer number (20223205).

Almost surely, 2^40446409 is an apocalyptic number.

It is an amenable number.

40446409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40446409 is an equidigital number, since it uses as much as digits as its factorization.

40446409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 40446409 is about 6359.7491302724. The cubic root of 40446409 is about 343.2627333600.

The spelling of 40446409 in words is "forty million, four hundred forty-six thousand, four hundred nine".