40439293 has 2 divisors, whose sum is σ = 40439294. Its totient is φ = 40439292.

The previous prime is 40439291. The next prime is 40439297. The reversal of 40439293 is 39293404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40424164 + 15129 = 6358^2 + 123^2 .

It is a cyclic number.

It is not a de Polignac number, because 40439293 - 2¹ = 40439291 is a prime.

Together with 40439291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40439291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20219646 + 20219647.

It is an arithmetic number, because the mean of its divisors is an integer number (20219647).

Almost surely, 2^40439293 is an apocalyptic number.

It is an amenable number.

40439293 is a deficient number, since it is larger than the sum of its proper divisors (1).

40439293 is an equidigital number, since it uses as much as digits as its factorization.

40439293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 40439293 is about 6359.1896496330. The cubic root of 40439293 is about 343.2426013636.

The spelling of 40439293 in words is "forty million, four hundred thirty-nine thousand, two hundred ninety-three".