42877821 has 16 divisors (see below), whose sum is σ = 65429504. Its totient is φ = 24467184.

The previous prime is 42877817. The next prime is 42877847. The reversal of 42877821 is 12877824.

It is not a de Polignac number, because 42877821 - 2² = 42877817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42877821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42877801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26580 + ... + 28146.

It is an arithmetic number, because the mean of its divisors is an integer number (4089344).

Almost surely, 2^42877821 is an apocalyptic number.

It is an amenable number.

42877821 is a deficient number, since it is larger than the sum of its proper divisors (22551683).

42877821 is a wasteful number, since it uses less digits than its factorization.

42877821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880.

The product of its digits is 50176, while the sum is 39.

The square root of 42877821 is about 6548.1158358722. The cubic root of 42877821 is about 350.0076760221.

The spelling of 42877821 in words is "forty-two million, eight hundred seventy-seven thousand, eight hundred twenty-one".