42984917 has 2 divisors, whose sum is σ = 42984918. Its totient is φ = 42984916.

The previous prime is 42984911. The next prime is 42984919. The reversal of 42984917 is 71948924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29691601 + 13293316 = 5449^2 + 3646^2 .

It is a cyclic number.

It is not a de Polignac number, because 42984917 - 2¹⁰ = 42983893 is a prime.

Together with 42984919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42984911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21492458 + 21492459.

It is an arithmetic number, because the mean of its divisors is an integer number (21492459).

Almost surely, 2^42984917 is an apocalyptic number.

It is an amenable number.

42984917 is a deficient number, since it is larger than the sum of its proper divisors (1).

42984917 is an equidigital number, since it uses as much as digits as its factorization.

42984917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 42984917 is about 6556.2883554645. The cubic root of 42984917 is about 350.2988386491.

The spelling of 42984917 in words is "forty-two million, nine hundred eighty-four thousand, nine hundred seventeen".