42691786 has 4 divisors (see below), whose sum is σ = 64037682. Its totient is φ = 21345892.

The previous prime is 42691771. The next prime is 42691801. The reversal of 42691786 is 68719624.

42691786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (42691771) and next prime (42691801).

It can be written as a sum of positive squares in only one way, i.e., 41357761 + 1334025 = 6431^2 + 1155^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672945 + ... + 10672948.

Almost surely, 2^42691786 is an apocalyptic number.

42691786 is a deficient number, since it is larger than the sum of its proper divisors (21345896).

42691786 is a wasteful number, since it uses less digits than its factorization.

42691786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21345895.

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

The square root of 42691786 is about 6533.8951629178. The cubic root of 42691786 is about 349.5007466881.

The spelling of 42691786 in words is "forty-two million, six hundred ninety-one thousand, seven hundred eighty-six".