40138771 has 2 divisors, whose sum is σ = 40138772. Its totient is φ = 40138770.

The previous prime is 40138729. The next prime is 40138801. The reversal of 40138771 is 17783104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40138771 - 2¹³ = 40130579 is a prime.

It is a super-2 number, since 2×40138771² = 3222241874780882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40138711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069385 + 20069386.

It is an arithmetic number, because the mean of its divisors is an integer number (20069386).

Almost surely, 2^40138771 is an apocalyptic number.

40138771 is a deficient number, since it is larger than the sum of its proper divisors (1).

40138771 is an equidigital number, since it uses as much as digits as its factorization.

40138771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 40138771 is about 6335.5166324460. The cubic root of 40138771 is about 342.3902246450.

The spelling of 40138771 in words is "forty million, one hundred thirty-eight thousand, seven hundred seventy-one".