40023839 has 2 divisors, whose sum is σ = 40023840. Its totient is φ = 40023838.

The previous prime is 40023811. The next prime is 40023871. The reversal of 40023839 is 93832004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40023839 - 2¹² = 40019743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40022839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20011919 + 20011920.

It is an arithmetic number, because the mean of its divisors is an integer number (20011920).

Almost surely, 2^40023839 is an apocalyptic number.

40023839 is a deficient number, since it is larger than the sum of its proper divisors (1).

40023839 is an equidigital number, since it uses as much as digits as its factorization.

40023839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 40023839 is about 6326.4396780496. The cubic root of 40023839 is about 342.0631160372.

The spelling of 40023839 in words is "forty million, twenty-three thousand, eight hundred thirty-nine".