42491784 has 16 divisors (see below), whose sum is σ = 106229520. Its totient is φ = 14163920.

The previous prime is 42491777. The next prime is 42491819. The reversal of 42491784 is 48719424.

It is a super-3 number, since 3×42491784³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885222 + ... + 885269.

It is an arithmetic number, because the mean of its divisors is an integer number (6639345).

Almost surely, 2^42491784 is an apocalyptic number.

It is an amenable number.

42491784 is an abundant number, since it is smaller than the sum of its proper divisors (63737736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42491784 is a wasteful number, since it uses less digits than its factorization.

42491784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770500 (or 1770496 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 42491784 is about 6518.5722363106. The cubic root of 42491784 is about 348.9541131176.

The spelling of 42491784 in words is "forty-two million, four hundred ninety-one thousand, seven hundred eighty-four".