42243247 has 2 divisors, whose sum is σ = 42243248. Its totient is φ = 42243246.

The previous prime is 42243241. The next prime is 42243259. The reversal of 42243247 is 74234224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42243247 - 2³ = 42243239 is a prime.

It is equal to p_2561509 and since 42243247 and 2561509 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42243241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21121623 + 21121624.

It is an arithmetic number, because the mean of its divisors is an integer number (21121624).

Almost surely, 2^42243247 is an apocalyptic number.

42243247 is a deficient number, since it is larger than the sum of its proper divisors (1).

42243247 is an equidigital number, since it uses as much as digits as its factorization.

42243247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 28.

The square root of 42243247 is about 6499.4805177029. The cubic root of 42243247 is about 348.2724311210.

The spelling of 42243247 in words is "forty-two million, two hundred forty-three thousand, two hundred forty-seven".