40870639 has 2 divisors, whose sum is σ = 40870640. Its totient is φ = 40870638.

The previous prime is 40870637. The next prime is 40870649. The reversal of 40870639 is 93607804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40870639 - 2¹ = 40870637 is a prime.

Together with 40870637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 40870598 and 40870607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40870633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20435319 + 20435320.

It is an arithmetic number, because the mean of its divisors is an integer number (20435320).

Almost surely, 2^40870639 is an apocalyptic number.

40870639 is a deficient number, since it is larger than the sum of its proper divisors (1).

40870639 is an equidigital number, since it uses as much as digits as its factorization.

40870639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 40870639 is about 6393.0148599859. The cubic root of 40870639 is about 344.4586876255.

The spelling of 40870639 in words is "forty million, eight hundred seventy thousand, six hundred thirty-nine".