42399361 has 2 divisors, whose sum is σ = 42399362. Its totient is φ = 42399360.

The previous prime is 42399353. The next prime is 42399389. The reversal of 42399361 is 16399324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41525136 + 874225 = 6444^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 42399361 - 2³ = 42399353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42399361.

It is not a weakly prime, because it can be changed into another prime (42399341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21199680 + 21199681.

It is an arithmetic number, because the mean of its divisors is an integer number (21199681).

Almost surely, 2^42399361 is an apocalyptic number.

It is an amenable number.

42399361 is a deficient number, since it is larger than the sum of its proper divisors (1).

42399361 is an equidigital number, since it uses as much as digits as its factorization.

42399361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 37.

The square root of 42399361 is about 6511.4791714326. The cubic root of 42399361 is about 348.7009285067.

Subtracting from 42399361 its sum of digits (37), we obtain a palindrome (42399324).

The spelling of 42399361 in words is "forty-two million, three hundred ninety-nine thousand, three hundred sixty-one".