42219823 has 4 divisors (see below), whose sum is σ = 44703360. Its totient is φ = 39736288.

The previous prime is 42219817. The next prime is 42219829. The reversal of 42219823 is 32891224.

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

It is an interprime number because it is at equal distance from previous prime (42219817) and next prime (42219829).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42219823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42219829) 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, 1241743 + ... + 1241776.

It is an arithmetic number, because the mean of its divisors is an integer number (11175840).

Almost surely, 2^42219823 is an apocalyptic number.

42219823 is a deficient number, since it is larger than the sum of its proper divisors (2483537).

42219823 is a wasteful number, since it uses less digits than its factorization.

42219823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483536.

The product of its digits is 6912, while the sum is 31.

The square root of 42219823 is about 6497.6782776620. The cubic root of 42219823 is about 348.2080465362.

The spelling of 42219823 in words is "forty-two million, two hundred nineteen thousand, eight hundred twenty-three".