42223997 has 2 divisors, whose sum is σ = 42223998. Its totient is φ = 42223996.

The previous prime is 42223981. The next prime is 42224033. The reversal of 42223997 is 79932224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30349081 + 11874916 = 5509^2 + 3446^2 .

It is a cyclic number.

It is not a de Polignac number, because 42223997 - 2⁴ = 42223981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42223997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42223927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21111998 + 21111999.

It is an arithmetic number, because the mean of its divisors is an integer number (21111999).

Almost surely, 2^42223997 is an apocalyptic number.

It is an amenable number.

42223997 is a deficient number, since it is larger than the sum of its proper divisors (1).

42223997 is an equidigital number, since it uses as much as digits as its factorization.

42223997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 38.

The square root of 42223997 is about 6497.9994613727. Note that the first 3 decimals coincide. The cubic root of 42223997 is about 348.2195211816.

It can be divided in two parts, 4 and 2223997, that multiplied together give a palindrome (8895988).

The spelling of 42223997 in words is "forty-two million, two hundred twenty-three thousand, nine hundred ninety-seven".