40520839 has 2 divisors, whose sum is σ = 40520840. Its totient is φ = 40520838.

The previous prime is 40520791. The next prime is 40520861. The reversal of 40520839 is 93802504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40520839 - 2¹¹ = 40518791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40520839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40520869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20260419 + 20260420.

It is an arithmetic number, because the mean of its divisors is an integer number (20260420).

Almost surely, 2^40520839 is an apocalyptic number.

40520839 is a deficient number, since it is larger than the sum of its proper divisors (1).

40520839 is an equidigital number, since it uses as much as digits as its factorization.

40520839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 40520839 is about 6365.5980865901. The cubic root of 40520839 is about 343.4731631607.

The spelling of 40520839 in words is "forty million, five hundred twenty thousand, eight hundred thirty-nine".