42399061 has 2 divisors, whose sum is σ = 42399062. Its totient is φ = 42399060.

The previous prime is 42399001. The next prime is 42399083. The reversal of 42399061 is 16099324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30184036 + 12215025 = 5494^2 + 3495^2 .

It is a cyclic number.

It is not a de Polignac number, because 42399061 - 2¹⁹ = 41874773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42399001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21199530 + 21199531.

It is an arithmetic number, because the mean of its divisors is an integer number (21199531).

Almost surely, 2^42399061 is an apocalyptic number.

It is an amenable number.

42399061 is a deficient number, since it is larger than the sum of its proper divisors (1).

42399061 is an equidigital number, since it uses as much as digits as its factorization.

42399061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 42399061 is about 6511.4561351513. The cubic root of 42399061 is about 348.7001060845.

The spelling of 42399061 in words is "forty-two million, three hundred ninety-nine thousand, sixty-one".