42789287 has 2 divisors, whose sum is σ = 42789288. Its totient is φ = 42789286.

The previous prime is 42789283. The next prime is 42789359. The reversal of 42789287 is 78298724.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42789287 - 2² = 42789283 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42789283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21394643 + 21394644.

It is an arithmetic number, because the mean of its divisors is an integer number (21394644).

Almost surely, 2^42789287 is an apocalyptic number.

42789287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42789287 is an equidigital number, since it uses as much as digits as its factorization.

42789287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 42789287 is about 6541.3520773614. The cubic root of 42789287 is about 349.7666117527.

The spelling of 42789287 in words is "forty-two million, seven hundred eighty-nine thousand, two hundred eighty-seven".