42365381 has 2 divisors, whose sum is σ = 42365382. Its totient is φ = 42365380.

The previous prime is 42365339. The next prime is 42365399. The reversal of 42365381 is 18356324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 19945156 = 4735^2 + 4466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42365381 is a prime.

It is a super-2 number, since 2×42365381² = 3589651014550322, which contains 22 as substring.

It is equal to p_2568515 and since 42365381 and 2568515 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42365311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21182690 + 21182691.

It is an arithmetic number, because the mean of its divisors is an integer number (21182691).

Almost surely, 2^42365381 is an apocalyptic number.

It is an amenable number.

42365381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42365381 is an equidigital number, since it uses as much as digits as its factorization.

42365381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 42365381 is about 6508.8694102740. The cubic root of 42365381 is about 348.6077508108.

The spelling of 42365381 in words is "forty-two million, three hundred sixty-five thousand, three hundred eighty-one".