42788991 has 16 divisors (see below), whose sum is σ = 65539584. Its totient is φ = 24324384.

The previous prime is 42788971. The next prime is 42789001. The reversal of 42788991 is 19988724.

It is not a de Polignac number, because 42788991 - 2¹⁴ = 42772607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42788991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42788971) 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, 1035 + ... + 9308.

It is an arithmetic number, because the mean of its divisors is an integer number (4096224).

Almost surely, 2^42788991 is an apocalyptic number.

42788991 is a deficient number, since it is larger than the sum of its proper divisors (22750593).

42788991 is a wasteful number, since it uses less digits than its factorization.

42788991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550.

The product of its digits is 290304, while the sum is 48.

The square root of 42788991 is about 6541.3294520304. The cubic root of 42788991 is about 349.7658052335.

The spelling of 42788991 in words is "forty-two million, seven hundred eighty-eight thousand, nine hundred ninety-one".