42090609 has 16 divisors (see below), whose sum is σ = 61332480. Its totient is φ = 25463760.

The previous prime is 42090583. The next prime is 42090613. The reversal of 42090609 is 90609024.

It is not a de Polignac number, because 42090609 - 2⁵ = 42090577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42090649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31252 + ... + 32570.

It is an arithmetic number, because the mean of its divisors is an integer number (3833280).

Almost surely, 2^42090609 is an apocalyptic number.

It is an amenable number.

42090609 is a deficient number, since it is larger than the sum of its proper divisors (19241871).

42090609 is a wasteful number, since it uses less digits than its factorization.

42090609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 42090609 is about 6487.7275682630. The cubic root of 42090609 is about 347.8524526443.

The spelling of 42090609 in words is "forty-two million, ninety thousand, six hundred nine".