42665786 has 8 divisors (see below), whose sum is σ = 66205620. Its totient is φ = 20597248.

The previous prime is 42665747. The next prime is 42665803. The reversal of 42665786 is 68756624.

It can be written as a sum of positive squares in 2 ways, for example, as 40005625 + 2660161 = 6325^2 + 1631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367751 + ... + 367866.

Almost surely, 2^42665786 is an apocalyptic number.

42665786 is a deficient number, since it is larger than the sum of its proper divisors (23539834).

42665786 is a wasteful number, since it uses less digits than its factorization.

42665786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735648.

The product of its digits is 483840, while the sum is 44.

The square root of 42665786 is about 6531.9052350750. The cubic root of 42665786 is about 349.4297817117.

The spelling of 42665786 in words is "forty-two million, six hundred sixty-five thousand, seven hundred eighty-six".