42319819 has 2 divisors, whose sum is σ = 42319820. Its totient is φ = 42319818.

The previous prime is 42319799. The next prime is 42319843. The reversal of 42319819 is 91891324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42319819 - 2¹¹ = 42317771 is a prime.

It is a super-2 number, since 2×42319819² = 3581934160385522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42319019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21159909 + 21159910.

It is an arithmetic number, because the mean of its divisors is an integer number (21159910).

Almost surely, 2^42319819 is an apocalyptic number.

42319819 is a deficient number, since it is larger than the sum of its proper divisors (1).

42319819 is an equidigital number, since it uses as much as digits as its factorization.

42319819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 42319819 is about 6505.3684753440. The cubic root of 42319819 is about 348.4827355013.

The spelling of 42319819 in words is "forty-two million, three hundred nineteen thousand, eight hundred nineteen".