39940919 has 2 divisors, whose sum is σ = 39940920. Its totient is φ = 39940918.

The previous prime is 39940897. The next prime is 39940921. The reversal of 39940919 is 91904993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39940919 - 2¹² = 39936823 is a prime.

It is a super-2 number, since 2×39940919² = 3190554021129122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 39940921, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39940919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39940319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19970459 + 19970460.

It is an arithmetic number, because the mean of its divisors is an integer number (19970460).

Almost surely, 2^39940919 is an apocalyptic number.

39940919 is a deficient number, since it is larger than the sum of its proper divisors (1).

39940919 is an equidigital number, since it uses as much as digits as its factorization.

39940919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 39940919 is about 6319.8828311924. The cubic root of 39940919 is about 341.8267278860.

The spelling of 39940919 in words is "thirty-nine million, nine hundred forty thousand, nine hundred nineteen".