42001001 has 32 divisors (see below), whose sum is σ = 53329920. Its totient is φ = 32270400.

The previous prime is 42000997. The next prime is 42001021. The reversal of 42001001 is 10010024.

It is a cyclic number.

It is not a de Polignac number, because 42001001 - 2² = 42000997 is a prime.

42001001 is a modest number, since divided by 1001 gives 42 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 42001001.

It is not an unprimeable number, because it can be changed into a prime (42001021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251420 + ... + 251586.

It is an arithmetic number, because the mean of its divisors is an integer number (1666560).

Almost surely, 2^42001001 is an apocalyptic number.

It is an amenable number.

42001001 is a deficient number, since it is larger than the sum of its proper divisors (11328919).

42001001 is a wasteful number, since it uses less digits than its factorization.

42001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 42001001 is about 6480.8179267744. The cubic root of 42001001 is about 347.6054259768.

Adding to 42001001 its reverse (10010024), we get a palindrome (52011025).

The spelling of 42001001 in words is "forty-two million, one thousand, one".