40539439 has 2 divisors, whose sum is σ = 40539440. Its totient is φ = 40539438.

The previous prime is 40539397. The next prime is 40539463. The reversal of 40539439 is 93493504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40539439 - 2⁷ = 40539311 is a prime.

It is a super-2 number, since 2×40539439² = 3286892228869442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40539398 and 40539407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40539469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20269719 + 20269720.

It is an arithmetic number, because the mean of its divisors is an integer number (20269720).

Almost surely, 2^40539439 is an apocalyptic number.

40539439 is a deficient number, since it is larger than the sum of its proper divisors (1).

40539439 is an equidigital number, since it uses as much as digits as its factorization.

40539439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 40539439 is about 6367.0588971675. The cubic root of 40539439 is about 343.5257091571.

The spelling of 40539439 in words is "forty million, five hundred thirty-nine thousand, four hundred thirty-nine".