42420379 has 2 divisors, whose sum is σ = 42420380. Its totient is φ = 42420378.

The previous prime is 42420377. The next prime is 42420401. The reversal of 42420379 is 97302424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42420379 - 2¹ = 42420377 is a prime.

Together with 42420377, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42420379.

It is not a weakly prime, because it can be changed into another prime (42420377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21210189 + 21210190.

It is an arithmetic number, because the mean of its divisors is an integer number (21210190).

Almost surely, 2^42420379 is an apocalyptic number.

42420379 is a deficient number, since it is larger than the sum of its proper divisors (1).

42420379 is an equidigital number, since it uses as much as digits as its factorization.

42420379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 42420379 is about 6513.0928904784. The cubic root of 42420379 is about 348.7585377508.

The spelling of 42420379 in words is "forty-two million, four hundred twenty thousand, three hundred seventy-nine".