42491817 has 8 divisors (see below), whose sum is σ = 62950880. Its totient is φ = 28327860.

The previous prime is 42491777. The next prime is 42491819. The reversal of 42491817 is 71819424.

42491817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42491817 - 2⁷ = 42491689 is a prime.

It is a super-2 number, since 2×42491817² = 3611109023922978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42491819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786859 + ... + 786912.

It is an arithmetic number, because the mean of its divisors is an integer number (7868860).

Almost surely, 2^42491817 is an apocalyptic number.

It is an amenable number.

42491817 is a deficient number, since it is larger than the sum of its proper divisors (20459063).

42491817 is a wasteful number, since it uses less digits than its factorization.

42491817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573780 (or 1573774 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 42491817 is about 6518.5747675393. The cubic root of 42491817 is about 348.9542034526.

The spelling of 42491817 in words is "forty-two million, four hundred ninety-one thousand, eight hundred seventeen".