40439879 has 2 divisors, whose sum is σ = 40439880. Its totient is φ = 40439878.

The previous prime is 40439837. The next prime is 40439939. The reversal of 40439879 is 97893404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40439879 - 2¹⁶ = 40374343 is a prime.

It is a super-3 number, since 3×40439879³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40439579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20219939 + 20219940.

It is an arithmetic number, because the mean of its divisors is an integer number (20219940).

Almost surely, 2^40439879 is an apocalyptic number.

40439879 is a deficient number, since it is larger than the sum of its proper divisors (1).

40439879 is an equidigital number, since it uses as much as digits as its factorization.

40439879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 40439879 is about 6359.2357245191. The cubic root of 40439879 is about 343.2442593154.

The spelling of 40439879 in words is "forty million, four hundred thirty-nine thousand, eight hundred seventy-nine".