40005379 has 2 divisors, whose sum is σ = 40005380. Its totient is φ = 40005378.

The previous prime is 40005377. The next prime is 40005397. The reversal of 40005379 is 97350004.

Together with next prime (40005397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40005379 - 2¹ = 40005377 is a prime.

Together with 40005377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40005373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20002689 + 20002690.

It is an arithmetic number, because the mean of its divisors is an integer number (20002690).

Almost surely, 2^40005379 is an apocalyptic number.

40005379 is a deficient number, since it is larger than the sum of its proper divisors (1).

40005379 is an equidigital number, since it uses as much as digits as its factorization.

40005379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 40005379 is about 6324.9805533298. The cubic root of 40005379 is about 342.0105185826.

The spelling of 40005379 in words is "forty million, five thousand, three hundred seventy-nine".