42090785 has 8 divisors (see below), whose sum is σ = 55100736. Its totient is φ = 30611440.

The previous prime is 42090781. The next prime is 42090787. The reversal of 42090785 is 58709024.

It is a happy number.

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

It is not a de Polignac number, because 42090785 - 2² = 42090781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42090781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382589 + ... + 382698.

It is an arithmetic number, because the mean of its divisors is an integer number (6887592).

Almost surely, 2^42090785 is an apocalyptic number.

It is an amenable number.

42090785 is a deficient number, since it is larger than the sum of its proper divisors (13009951).

42090785 is a wasteful number, since it uses less digits than its factorization.

42090785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765303.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 42090785 is about 6487.7411323202. The cubic root of 42090785 is about 347.8529374868.

It can be divided in two parts, 42090 and 785, that added together give a cube (42875 = 35³).

The spelling of 42090785 in words is "forty-two million, ninety thousand, seven hundred eighty-five".