42869781 has 12 divisors (see below), whose sum is σ = 63241152. Its totient is φ = 27971496.

The previous prime is 42869779. The next prime is 42869821. The reversal of 42869781 is 18796824.

It is not a de Polignac number, because 42869781 - 2¹ = 42869779 is a prime.

It is a super-2 number, since 2×42869781² = 3675636245975922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42869731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50251 + ... + 51096.

It is an arithmetic number, because the mean of its divisors is an integer number (5270096).

Almost surely, 2^42869781 is an apocalyptic number.

It is an amenable number.

42869781 is a deficient number, since it is larger than the sum of its proper divisors (20371371).

42869781 is a wasteful number, since it uses less digits than its factorization.

42869781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101400 (or 101397 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 42869781 is about 6547.5018900341. The cubic root of 42869781 is about 349.9857980632.

The spelling of 42869781 in words is "forty-two million, eight hundred sixty-nine thousand, seven hundred eighty-one".