40405139 has 2 divisors, whose sum is σ = 40405140. Its totient is φ = 40405138.

The previous prime is 40405117. The next prime is 40405163. The reversal of 40405139 is 93150404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40405139 - 2¹² = 40401043 is a prime.

It is not a weakly prime, because it can be changed into another prime (40405109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202569 + 20202570.

It is an arithmetic number, because the mean of its divisors is an integer number (20202570).

Almost surely, 2^40405139 is an apocalyptic number.

40405139 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405139 is an equidigital number, since it uses as much as digits as its factorization.

40405139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 40405139 is about 6356.5036773371. The cubic root of 40405139 is about 343.1459428183.

The spelling of 40405139 in words is "forty million, four hundred five thousand, one hundred thirty-nine".