42387287 has 2 divisors, whose sum is σ = 42387288. Its totient is φ = 42387286.

The previous prime is 42387217. The next prime is 42387329. The reversal of 42387287 is 78278324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42387287 - 2⁸ = 42387031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42387217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21193643 + 21193644.

It is an arithmetic number, because the mean of its divisors is an integer number (21193644).

Almost surely, 2^42387287 is an apocalyptic number.

42387287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42387287 is an equidigital number, since it uses as much as digits as its factorization.

42387287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 41.

The square root of 42387287 is about 6510.5519735273. The cubic root of 42387287 is about 348.6678256908.

The spelling of 42387287 in words is "forty-two million, three hundred eighty-seven thousand, two hundred eighty-seven".