42783831 has 12 divisors (see below), whose sum is σ = 62400208. Its totient is φ = 28245024.

The previous prime is 42783823. The next prime is 42783833. The reversal of 42783831 is 13838724.

42783831 is a `hidden beast` number, since 4 + 278 + 383 + 1 = 666.

42783831 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 42783831 - 2³ = 42783823 is a prime.

It is a super-2 number, since 2×42783831² = 3660912390073122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42783833) 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 11 ways as a sum of consecutive naturals, for example, 22150 + ... + 24003.

Almost surely, 2^42783831 is an apocalyptic number.

42783831 is a deficient number, since it is larger than the sum of its proper divisors (19616377).

42783831 is a wasteful number, since it uses less digits than its factorization.

42783831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46262 (or 46259 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 42783831 is about 6540.9350249028. The cubic root of 42783831 is about 349.7517450429.

The spelling of 42783831 in words is "forty-two million, seven hundred eighty-three thousand, eight hundred thirty-one".