42207989 has 4 divisors (see below), whose sum is σ = 42325920. Its totient is φ = 42090060.

The previous prime is 42207959. The next prime is 42208003. The reversal of 42207989 is 98970224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42207989 - 2¹⁶ = 42142453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42207929) 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 3 ways as a sum of consecutive naturals, for example, 58427 + ... + 59144.

It is an arithmetic number, because the mean of its divisors is an integer number (10581480).

Almost surely, 2^42207989 is an apocalyptic number.

It is an amenable number.

42207989 is a deficient number, since it is larger than the sum of its proper divisors (117931).

42207989 is a wasteful number, since it uses less digits than its factorization.

42207989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117930.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 42207989 is about 6496.7675808820. The cubic root of 42207989 is about 348.1755098525.

The spelling of 42207989 in words is "forty-two million, two hundred seven thousand, nine hundred eighty-nine".