42442993 has 2 divisors, whose sum is σ = 42442994. Its totient is φ = 42442992.

The previous prime is 42442969. The next prime is 42442997. The reversal of 42442993 is 39924424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35724529 + 6718464 = 5977^2 + 2592^2 .

It is a cyclic number.

It is not a de Polignac number, because 42442993 - 2¹⁷ = 42311921 is a prime.

It is not a weakly prime, because it can be changed into another prime (42442997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221496 + 21221497.

It is an arithmetic number, because the mean of its divisors is an integer number (21221497).

Almost surely, 2^42442993 is an apocalyptic number.

It is an amenable number.

42442993 is a deficient number, since it is larger than the sum of its proper divisors (1).

42442993 is an equidigital number, since it uses as much as digits as its factorization.

42442993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 42442993 is about 6514.8287007411. The cubic root of 42442993 is about 348.8205003005.

Subtracting from 42442993 its reverse (39924424), we obtain a square (2518569 = 1587²).

The spelling of 42442993 in words is "forty-two million, four hundred forty-two thousand, nine hundred ninety-three".