40128719 has 2 divisors, whose sum is σ = 40128720. Its totient is φ = 40128718.

The previous prime is 40128707. The next prime is 40128731. The reversal of 40128719 is 91782104.

It is a balanced prime because it is at equal distance from previous prime (40128707) and next prime (40128731).

It is a cyclic number.

It is not a de Polignac number, because 40128719 - 2²⁰ = 39080143 is a prime.

It is a super-2 number, since 2×40128719² = 3220628177161922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40128769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064359 + 20064360.

It is an arithmetic number, because the mean of its divisors is an integer number (20064360).

Almost surely, 2^40128719 is an apocalyptic number.

40128719 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128719 is an equidigital number, since it uses as much as digits as its factorization.

40128719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 40128719 is about 6334.7232773026. The cubic root of 40128719 is about 342.3616405289.

The spelling of 40128719 in words is "forty million, one hundred twenty-eight thousand, seven hundred nineteen".