42188709 has 16 divisors (see below), whose sum is σ = 57189888. Its totient is φ = 27660912.

The previous prime is 42188687. The next prime is 42188711. The reversal of 42188709 is 90788124.

It is not a de Polignac number, because 42188709 - 2⁸ = 42188453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42188749) 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, 53214 + ... + 54000.

It is an arithmetic number, because the mean of its divisors is an integer number (3574368).

Almost surely, 2^42188709 is an apocalyptic number.

It is an amenable number.

42188709 is a deficient number, since it is larger than the sum of its proper divisors (15001179).

42188709 is a wasteful number, since it uses less digits than its factorization.

42188709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 42188709 is about 6495.2835965799. The cubic root of 42188709 is about 348.1224879297.

The spelling of 42188709 in words is "forty-two million, one hundred eighty-eight thousand, seven hundred nine".