42001822 has 4 divisors (see below), whose sum is σ = 63002736. Its totient is φ = 21000910.

The previous prime is 42001819. The next prime is 42001829. The reversal of 42001822 is 22810024.

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 42001822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42001829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500454 + ... + 10500457.

It is an arithmetic number, because the mean of its divisors is an integer number (15750684).

Almost surely, 2^42001822 is an apocalyptic number.

42001822 is a deficient number, since it is larger than the sum of its proper divisors (21000914).

42001822 is a wasteful number, since it uses less digits than its factorization.

42001822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21000913.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 42001822 is about 6480.8812672352. The cubic root of 42001822 is about 347.6076908608.

Adding to 42001822 its reverse (22810024), we get a palindrome (64811846).

The spelling of 42001822 in words is "forty-two million, one thousand, eight hundred twenty-two".