40640519 has 2 divisors, whose sum is σ = 40640520. Its totient is φ = 40640518.

The previous prime is 40640507. The next prime is 40640521. The reversal of 40640519 is 91504604.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40640519 is a prime.

It is a super-2 number, since 2×40640519² = 3303303569178722, which contains 22 as substring.

Together with 40640521, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40640491 and 40640500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40640569) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20320259 + 20320260.

It is an arithmetic number, because the mean of its divisors is an integer number (20320260).

Almost surely, 2^40640519 is an apocalyptic number.

40640519 is a deficient number, since it is larger than the sum of its proper divisors (1).

40640519 is an equidigital number, since it uses as much as digits as its factorization.

40640519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40640519 is about 6374.9916862691. The cubic root of 40640519 is about 343.8109849265.

The spelling of 40640519 in words is "forty million, six hundred forty thousand, five hundred nineteen".