42281818 has 4 divisors (see below), whose sum is σ = 63422730. Its totient is φ = 21140908.

The previous prime is 42281807. The next prime is 42281831. The reversal of 42281818 is 81818224.

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

It can be written as a sum of positive squares in only one way, i.e., 33443089 + 8838729 = 5783^2 + 2973^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570453 + ... + 10570456.

Almost surely, 2^42281818 is an apocalyptic number.

42281818 is a deficient number, since it is larger than the sum of its proper divisors (21140912).

42281818 is a wasteful number, since it uses less digits than its factorization.

42281818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21140911.

The product of its digits is 8192, while the sum is 34.

The square root of 42281818 is about 6502.4470778315. The cubic root of 42281818 is about 348.3783977980.

It can be divided in two parts, 4 and 2281818, that added together give a palindrome (2281822).

The spelling of 42281818 in words is "forty-two million, two hundred eighty-one thousand, eight hundred eighteen".