42027989 has 4 divisors (see below), whose sum is σ = 43477260. Its totient is φ = 40578720.

The previous prime is 42027959. The next prime is 42027991. The reversal of 42027989 is 98972024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 33443089 = 2930^2 + 5783^2 .

It is a cyclic number.

It is not a de Polignac number, because 42027989 - 2²⁰ = 40979413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42027929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724592 + ... + 724649.

It is an arithmetic number, because the mean of its divisors is an integer number (10869315).

Almost surely, 2^42027989 is an apocalyptic number.

It is an amenable number.

42027989 is a deficient number, since it is larger than the sum of its proper divisors (1449271).

42027989 is a wasteful number, since it uses less digits than its factorization.

42027989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449270.

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

The square root of 42027989 is about 6482.8997370004. The cubic root of 42027989 is about 347.6798620332.

The spelling of 42027989 in words is "forty-two million, twenty-seven thousand, nine hundred eighty-nine".