42769681 has 4 divisors (see below), whose sum is σ = 42896932. Its totient is φ = 42642432.

The previous prime is 42769667. The next prime is 42769691. The reversal of 42769681 is 18696724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27206656 + 15563025 = 5216^2 + 3945^2 .

It is a cyclic number.

It is not a de Polignac number, because 42769681 - 2¹⁵ = 42736913 is a prime.

It is a super-2 number, since 2×42769681² = 3658491225683522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42769691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63120 + ... + 63793.

It is an arithmetic number, because the mean of its divisors is an integer number (10724233).

Almost surely, 2^42769681 is an apocalyptic number.

It is an amenable number.

42769681 is a deficient number, since it is larger than the sum of its proper divisors (127251).

42769681 is a wasteful number, since it uses less digits than its factorization.

42769681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127250.

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

The square root of 42769681 is about 6539.8532858161. The cubic root of 42769681 is about 349.7131827108.

The spelling of 42769681 in words is "forty-two million, seven hundred sixty-nine thousand, six hundred eighty-one".