42856769 has 2 divisors, whose sum is σ = 42856770. Its totient is φ = 42856768.

The previous prime is 42856757. The next prime is 42856777. The reversal of 42856769 is 96765824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 150544 = 6535^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 42856769 - 2²⁴ = 26079553 is a prime.

It is a super-2 number, since 2×42856769² = 3673405298238722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42856069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21428384 + 21428385.

It is an arithmetic number, because the mean of its divisors is an integer number (21428385).

Almost surely, 2^42856769 is an apocalyptic number.

It is an amenable number.

42856769 is a deficient number, since it is larger than the sum of its proper divisors (1).

42856769 is an equidigital number, since it uses as much as digits as its factorization.

42856769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 42856769 is about 6546.5081532066. The cubic root of 42856769 is about 349.9503848037.

The spelling of 42856769 in words is "forty-two million, eight hundred fifty-six thousand, seven hundred sixty-nine".