42020404 has 6 divisors (see below), whose sum is σ = 73535714. Its totient is φ = 21010200.

The previous prime is 42020393. The next prime is 42020437. The reversal of 42020404 is 40402024.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 6260004 = 5980^2 + 2502^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252547 + ... + 5252554.

Almost surely, 2^42020404 is an apocalyptic number.

It is an amenable number.

42020404 is a deficient number, since it is larger than the sum of its proper divisors (31515310).

42020404 is a wasteful number, since it uses less digits than its factorization.

42020404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505105 (or 10505103 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 42020404 is about 6482.3147100399. The cubic root of 42020404 is about 347.6589449374.

Adding to 42020404 its reverse (40402024), we get a palindrome (82422428).

It can be divided in two parts, 42020 and 404, that added together give a palindrome (42424).

The spelling of 42020404 in words is "forty-two million, twenty thousand, four hundred four".