42213638 has 4 divisors (see below), whose sum is σ = 63320460. Its totient is φ = 21106818.

The previous prime is 42213583. The next prime is 42213643. The reversal of 42213638 is 83631224.

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

It is a self number, because there is not a number n which added to its sum of digits gives 42213638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553408 + ... + 10553411.

It is an arithmetic number, because the mean of its divisors is an integer number (15830115).

Almost surely, 2^42213638 is an apocalyptic number.

42213638 is a deficient number, since it is larger than the sum of its proper divisors (21106822).

42213638 is a wasteful number, since it uses less digits than its factorization.

42213638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21106821.

The product of its digits is 6912, while the sum is 29.

The square root of 42213638 is about 6497.2023209994. The cubic root of 42213638 is about 348.1910421072.

The spelling of 42213638 in words is "forty-two million, two hundred thirteen thousand, six hundred thirty-eight".