42989191 has 16 divisors (see below), whose sum is σ = 51955200. Its totient is φ = 34747488.

The previous prime is 42989137. The next prime is 42989203. The reversal of 42989191 is 19198924.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42989191 - 2¹⁵ = 42956423 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 (42989101) 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, 34365 + ... + 35593.

It is an arithmetic number, because the mean of its divisors is an integer number (3247200).

Almost surely, 2^42989191 is an apocalyptic number.

42989191 is a deficient number, since it is larger than the sum of its proper divisors (8966009).

42989191 is a wasteful number, since it uses less digits than its factorization.

42989191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518.

The product of its digits is 46656, while the sum is 43.

The square root of 42989191 is about 6556.6142939783. The cubic root of 42989191 is about 350.3104483619.

The spelling of 42989191 in words is "forty-two million, nine hundred eighty-nine thousand, one hundred ninety-one".