42889121 has 4 divisors (see below), whose sum is σ = 46788144. Its totient is φ = 38990100.

The previous prime is 42889117. The next prime is 42889129. The reversal of 42889121 is 12198824.

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 42889121 - 2² = 42889117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42889129) 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, 1949495 + ... + 1949516.

It is an arithmetic number, because the mean of its divisors is an integer number (11697036).

Almost surely, 2^42889121 is an apocalyptic number.

It is an amenable number.

42889121 is a deficient number, since it is larger than the sum of its proper divisors (3899023).

42889121 is a wasteful number, since it uses less digits than its factorization.

42889121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3899022.

The product of its digits is 9216, while the sum is 35.

The square root of 42889121 is about 6548.9786226556. The cubic root of 42889121 is about 350.0384202722.

The spelling of 42889121 in words is "forty-two million, eight hundred eighty-nine thousand, one hundred twenty-one".