40040839 has 2 divisors, whose sum is σ = 40040840. Its totient is φ = 40040838.

The previous prime is 40040813. The next prime is 40040843. The reversal of 40040839 is 93804004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40040839 - 2⁵ = 40040807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40040849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20020419 + 20020420.

It is an arithmetic number, because the mean of its divisors is an integer number (20020420).

Almost surely, 2^40040839 is an apocalyptic number.

40040839 is a deficient number, since it is larger than the sum of its proper divisors (1).

40040839 is an equidigital number, since it uses as much as digits as its factorization.

40040839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 40040839 is about 6327.7831031097. The cubic root of 40040839 is about 342.1115392603. Note that the first 3 decimals are identical.

The spelling of 40040839 in words is "forty million, forty thousand, eight hundred thirty-nine".