40431439 has 2 divisors, whose sum is σ = 40431440. Its totient is φ = 40431438.

The previous prime is 40431437. The next prime is 40431467. The reversal of 40431439 is 93413404.

It is an a-pointer prime, because the next prime (40431467) can be obtained adding 40431439 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40431439 - 2¹ = 40431437 is a prime.

It is a super-2 number, since 2×40431439² = 3269402519221442, which contains 22 as substring.

Together with 40431437, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40431431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20215719 + 20215720.

It is an arithmetic number, because the mean of its divisors is an integer number (20215720).

Almost surely, 2^40431439 is an apocalyptic number.

40431439 is a deficient number, since it is larger than the sum of its proper divisors (1).

40431439 is an equidigital number, since it uses as much as digits as its factorization.

40431439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 40431439 is about 6358.5720881343. The cubic root of 40431439 is about 343.2203787370.

The spelling of 40431439 in words is "forty million, four hundred thirty-one thousand, four hundred thirty-nine".