401242042 has 4 divisors (see below), whose sum is σ = 601863066. Its totient is φ = 200621020.

The previous prime is 401242033. The next prime is 401242063. The reversal of 401242042 is 240242104.

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., 245266921 + 155975121 = 15661^2 + 12489^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100310509 + ... + 100310512.

Almost surely, 2^401242042 is an apocalyptic number.

401242042 is a deficient number, since it is larger than the sum of its proper divisors (200621024).

401242042 is a wasteful number, since it uses less digits than its factorization.

401242042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200621023.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 401242042 is about 20031.0269831579. The cubic root of 401242042 is about 737.5681320566.

Adding to 401242042 its reverse (240242104), we get a palindrome (641484146).

The spelling of 401242042 in words is "four hundred one million, two hundred forty-two thousand, forty-two".