42766819 has 2 divisors, whose sum is σ = 42766820. Its totient is φ = 42766818.

The previous prime is 42766769. The next prime is 42766961. The reversal of 42766819 is 91866724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42766819 - 2¹³ = 42758627 is a prime.

It is a super-2 number, since 2×42766819² = 3658001614757522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42766519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21383409 + 21383410.

It is an arithmetic number, because the mean of its divisors is an integer number (21383410).

Almost surely, 2^42766819 is an apocalyptic number.

42766819 is a deficient number, since it is larger than the sum of its proper divisors (1).

42766819 is an equidigital number, since it uses as much as digits as its factorization.

42766819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 42766819 is about 6539.6344699073. The cubic root of 42766819 is about 349.7053820022.

The spelling of 42766819 in words is "forty-two million, seven hundred sixty-six thousand, eight hundred nineteen".