40684379 has 2 divisors, whose sum is σ = 40684380. Its totient is φ = 40684378.

The previous prime is 40684351. The next prime is 40684381. The reversal of 40684379 is 97348604.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40684379 is a prime.

Together with 40684381, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40680379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342189 + 20342190.

It is an arithmetic number, because the mean of its divisors is an integer number (20342190).

Almost surely, 2^40684379 is an apocalyptic number.

40684379 is a deficient number, since it is larger than the sum of its proper divisors (1).

40684379 is an equidigital number, since it uses as much as digits as its factorization.

40684379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 40684379 is about 6378.4307631266. The cubic root of 40684379 is about 343.9346228517.

The spelling of 40684379 in words is "forty million, six hundred eighty-four thousand, three hundred seventy-nine".