42798787 has 2 divisors, whose sum is σ = 42798788. Its totient is φ = 42798786.

The previous prime is 42798781. The next prime is 42798799. The reversal of 42798787 is 78789724.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42798787 - 2¹⁹ = 42274499 is a prime.

It is not a weakly prime, because it can be changed into another prime (42798781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21399393 + 21399394.

It is an arithmetic number, because the mean of its divisors is an integer number (21399394).

Almost surely, 2^42798787 is an apocalyptic number.

42798787 is a deficient number, since it is larger than the sum of its proper divisors (1).

42798787 is an equidigital number, since it uses as much as digits as its factorization.

42798787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 52.

The square root of 42798787 is about 6542.0781866315. The cubic root of 42798787 is about 349.7924946872.

It can be divided in two parts, 4279 and 8787, that multiplied together give a palindrome (37599573).

The spelling of 42798787 in words is "forty-two million, seven hundred ninety-eight thousand, seven hundred eighty-seven".