40449989 has 2 divisors, whose sum is σ = 40449990. Its totient is φ = 40449988.

The previous prime is 40449979. The next prime is 40450027. The reversal of 40449989 is 98994404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29789764 + 10660225 = 5458^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 40449989 - 2¹⁶ = 40384453 is a prime.

It is a super-2 number, since 2×40449989² = 3272403220200242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40449949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20224994 + 20224995.

It is an arithmetic number, because the mean of its divisors is an integer number (20224995).

Almost surely, 2^40449989 is an apocalyptic number.

It is an amenable number.

40449989 is a deficient number, since it is larger than the sum of its proper divisors (1).

40449989 is an equidigital number, since it uses as much as digits as its factorization.

40449989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 40449989 is about 6360.0305816875. The cubic root of 40449989 is about 343.2728607060.

The spelling of 40449989 in words is "forty million, four hundred forty-nine thousand, nine hundred eighty-nine".