40026139 has 2 divisors, whose sum is σ = 40026140. Its totient is φ = 40026138.

The previous prime is 40026113. The next prime is 40026157. The reversal of 40026139 is 93162004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40026139 - 2⁹ = 40025627 is a prime.

It is not a weakly prime, because it can be changed into another prime (40926139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20013069 + 20013070.

It is an arithmetic number, because the mean of its divisors is an integer number (20013070).

Almost surely, 2^40026139 is an apocalyptic number.

40026139 is a deficient number, since it is larger than the sum of its proper divisors (1).

40026139 is an equidigital number, since it uses as much as digits as its factorization.

40026139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 40026139 is about 6326.6214522445. The cubic root of 40026139 is about 342.0696682164.

The spelling of 40026139 in words is "forty million, twenty-six thousand, one hundred thirty-nine".