42049989 has 8 divisors (see below), whose sum is σ = 62296320. Its totient is φ = 28033308.

The previous prime is 42049967. The next prime is 42049991. The reversal of 42049989 is 98994024.

It is not a de Polignac number, because 42049989 - 2¹² = 42045893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42049939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778677 + ... + 778730.

It is an arithmetic number, because the mean of its divisors is an integer number (7787040).

Almost surely, 2^42049989 is an apocalyptic number.

It is an amenable number.

42049989 is a deficient number, since it is larger than the sum of its proper divisors (20246331).

42049989 is a wasteful number, since it uses less digits than its factorization.

42049989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557416 (or 1557410 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 42049989 is about 6484.5962865856. The cubic root of 42049989 is about 347.7405170308.

The spelling of 42049989 in words is "forty-two million, forty-nine thousand, nine hundred eighty-nine".