42440287 has 2 divisors, whose sum is σ = 42440288. Its totient is φ = 42440286.

The previous prime is 42440263. The next prime is 42440291. The reversal of 42440287 is 78204424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42440287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42440257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21220143 + 21220144.

It is an arithmetic number, because the mean of its divisors is an integer number (21220144).

Almost surely, 2^42440287 is an apocalyptic number.

42440287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42440287 is an equidigital number, since it uses as much as digits as its factorization.

42440287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 42440287 is about 6514.6210173732. The cubic root of 42440287 is about 348.8130869972.

The spelling of 42440287 in words is "forty-two million, four hundred forty thousand, two hundred eighty-seven".