42208993 has 2 divisors, whose sum is σ = 42208994. Its totient is φ = 42208992.

The previous prime is 42208973. The next prime is 42209009. The reversal of 42208993 is 39980224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34012224 + 8196769 = 5832^2 + 2863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42208993 is a prime.

It is not a weakly prime, because it can be changed into another prime (42208963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104496 + 21104497.

It is an arithmetic number, because the mean of its divisors is an integer number (21104497).

Almost surely, 2^42208993 is an apocalyptic number.

It is an amenable number.

42208993 is a deficient number, since it is larger than the sum of its proper divisors (1).

42208993 is an equidigital number, since it uses as much as digits as its factorization.

42208993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 42208993 is about 6496.8448496174. The cubic root of 42208993 is about 348.1782705103.

The spelling of 42208993 in words is "forty-two million, two hundred eight thousand, nine hundred ninety-three".