42988417 has 4 divisors (see below), whose sum is σ = 43002180. Its totient is φ = 42974656.

The previous prime is 42988399. The next prime is 42988447. The reversal of 42988417 is 71488924.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 30569841 + 12418576 = 5529^2 + 3524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42988417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42988447) 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, 309 + ... + 9277.

It is an arithmetic number, because the mean of its divisors is an integer number (10750545).

Almost surely, 2^42988417 is an apocalyptic number.

It is an amenable number.

42988417 is a deficient number, since it is larger than the sum of its proper divisors (13763).

42988417 is an equidigital number, since it uses as much as digits as its factorization.

42988417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13762.

The product of its digits is 129024, while the sum is 43.

The square root of 42988417 is about 6556.5552693469. Note that the first 3 decimals coincide. The cubic root of 42988417 is about 350.3083459581.

The spelling of 42988417 in words is "forty-two million, nine hundred eighty-eight thousand, four hundred seventeen".