42831779 has 4 divisors (see below), whose sum is σ = 43232184. Its totient is φ = 42431376.

The previous prime is 42831751. The next prime is 42831787. The reversal of 42831779 is 97713824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42831779 - 2¹² = 42827683 is a prime.

It is a super-2 number, since 2×42831779² = 3669122584609682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42831709) 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, 200042 + ... + 200255.

It is an arithmetic number, because the mean of its divisors is an integer number (10808046).

Almost surely, 2^42831779 is an apocalyptic number.

42831779 is a deficient number, since it is larger than the sum of its proper divisors (400405).

42831779 is a wasteful number, since it uses less digits than its factorization.

42831779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400404.

The product of its digits is 84672, while the sum is 41.

The square root of 42831779 is about 6544.5992237875. The cubic root of 42831779 is about 349.8823522955.

The spelling of 42831779 in words is "forty-two million, eight hundred thirty-one thousand, seven hundred seventy-nine".