42389809 has 12 divisors (see below), whose sum is σ = 53251072. Its totient is φ = 33030360.

The previous prime is 42389797. The next prime is 42389833. The reversal of 42389809 is 90898324.

It is a happy number.

It is not a de Polignac number, because 42389809 - 2⁷ = 42389681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42389839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24177 + ... + 25870.

Almost surely, 2^42389809 is an apocalyptic number.

It is an amenable number.

42389809 is a deficient number, since it is larger than the sum of its proper divisors (10861263).

42389809 is a wasteful number, since it uses less digits than its factorization.

42389809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50076 (or 50065 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 42389809 is about 6510.7456562210. The cubic root of 42389809 is about 348.6747406794.

The spelling of 42389809 in words is "forty-two million, three hundred eighty-nine thousand, eight hundred nine".