42623866 has 4 divisors (see below), whose sum is σ = 63935802. Its totient is φ = 21311932.

The previous prime is 42623839. The next prime is 42623869. The reversal of 42623866 is 66832624.

42623866 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 can be written as a sum of positive squares in only one way, i.e., 36348841 + 6275025 = 6029^2 + 2505^2 .

It is not an unprimeable number, because it can be changed into a prime (42623869) by changing a digit.

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, 10655965 + ... + 10655968.

Almost surely, 2^42623866 is an apocalyptic number.

42623866 is a deficient number, since it is larger than the sum of its proper divisors (21311936).

42623866 is a wasteful number, since it uses less digits than its factorization.

42623866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21311935.

The product of its digits is 82944, while the sum is 37.

The square root of 42623866 is about 6528.6955818142. The cubic root of 42623866 is about 349.3153035956.

It can be divided in two parts, 4262 and 3866, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 42623866 in words is "forty-two million, six hundred twenty-three thousand, eight hundred sixty-six".