42090565 has 8 divisors (see below), whose sum is σ = 55100448. Its totient is φ = 30611280.

The previous prime is 42090557. The next prime is 42090577. The reversal of 42090565 is 56509024.

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

It is not a de Polignac number, because 42090565 - 2³ = 42090557 is a prime.

It is a super-3 number, since 3×42090565³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 382587 + ... + 382696.

It is an arithmetic number, because the mean of its divisors is an integer number (6887556).

Almost surely, 2^42090565 is an apocalyptic number.

It is an amenable number.

42090565 is a deficient number, since it is larger than the sum of its proper divisors (13009883).

42090565 is a wasteful number, since it uses less digits than its factorization.

42090565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765299.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 42090565 is about 6487.7241772443. The cubic root of 42090565 is about 347.8523314335.

Adding to 42090565 its reverse (56509024), we get a palindrome (98599589).

The spelling of 42090565 in words is "forty-two million, ninety thousand, five hundred sixty-five".