42789121 has 8 divisors (see below), whose sum is σ = 45780800. Its totient is φ = 39871440.

The previous prime is 42789113. The next prime is 42789127. The reversal of 42789121 is 12198724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42789121 - 2³ = 42789113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42789127) 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, 17301 + ... + 19618.

It is an arithmetic number, because the mean of its divisors is an integer number (5722600).

Almost surely, 2^42789121 is an apocalyptic number.

It is an amenable number.

42789121 is a deficient number, since it is larger than the sum of its proper divisors (2991679).

42789121 is a wasteful number, since it uses less digits than its factorization.

42789121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36999.

The product of its digits is 8064, while the sum is 34.

The square root of 42789121 is about 6541.3393888408. The cubic root of 42789121 is about 349.7661594485.

The spelling of 42789121 in words is "forty-two million, seven hundred eighty-nine thousand, one hundred twenty-one".