9040639 has 2 divisors, whose sum is σ = 9040640. Its totient is φ = 9040638.

The previous prime is 9040631. The next prime is 9040693. The reversal of 9040639 is 9360409.

9040639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (9040693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9040639 - 2³ = 9040631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9040639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9040631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4520319 + 4520320.

It is an arithmetic number, because the mean of its divisors is an integer number (4520320).

Almost surely, 2^9040639 is an apocalyptic number.

9040639 is a deficient number, since it is larger than the sum of its proper divisors (1).

9040639 is an equidigital number, since it uses as much as digits as its factorization.

9040639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 9040639 is about 3006.7655379161. The cubic root of 9040639 is about 208.3209956783.

The spelling of 9040639 in words is "nine million, forty thousand, six hundred thirty-nine".