905020042 has 4 divisors (see below), whose sum is σ = 1357530066. Its totient is φ = 452510020.

The previous prime is 905020033. The next prime is 905020043. The reversal of 905020042 is 240020509.

It is a happy number.

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., 848032641 + 56987401 = 29121^2 + 7549^2 .

It is a super-2 number, since 2×905020042² = 1638122552843363528, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 905019995 and 905020022.

It is not an unprimeable number, because it can be changed into a prime (905020043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 226255009 + ... + 226255012.

Almost surely, 2^905020042 is an apocalyptic number.

905020042 is a deficient number, since it is larger than the sum of its proper divisors (452510024).

905020042 is a wasteful number, since it uses less digits than its factorization.

905020042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452510023.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 905020042 is about 30083.5510204497. The cubic root of 905020042 is about 967.2811674036.

It can be divided in two parts, 9050 and 20042, that added together give a palindrome (29092).

The spelling of 905020042 in words is "nine hundred five million, twenty thousand, forty-two".