42444247 has 2 divisors, whose sum is σ = 42444248. Its totient is φ = 42444246.

The previous prime is 42444221. The next prime is 42444253. The reversal of 42444247 is 74244424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42444247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42444287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21222123 + 21222124.

It is an arithmetic number, because the mean of its divisors is an integer number (21222124).

Almost surely, 2^42444247 is an apocalyptic number.

42444247 is a deficient number, since it is larger than the sum of its proper divisors (1).

42444247 is an equidigital number, since it uses as much as digits as its factorization.

42444247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28672, while the sum is 31.

The square root of 42444247 is about 6514.9249420082. The cubic root of 42444247 is about 348.8239356268.

The spelling of 42444247 in words is "forty-two million, four hundred forty-four thousand, two hundred forty-seven".