402420404 has 6 divisors (see below), whose sum is σ = 704235714. Its totient is φ = 201210200.

The previous prime is 402420373. The next prime is 402420407. The reversal of 402420404 is 404024204.

It can be written as a sum of positive squares in only one way, i.e., 396408100 + 6012304 = 19910^2 + 2452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402420407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50302547 + ... + 50302554.

It is an arithmetic number, because the mean of its divisors is an integer number (117372619).

Almost surely, 2^402420404 is an apocalyptic number.

It is an amenable number.

402420404 is a deficient number, since it is larger than the sum of its proper divisors (301815310).

402420404 is a wasteful number, since it uses less digits than its factorization.

402420404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100605105 (or 100605103 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 402420404 is about 20060.4188390971. The cubic root of 402420404 is about 738.2894529761.

Adding to 402420404 its reverse (404024204), we get a palindrome (806444608).

The spelling of 402420404 in words is "four hundred two million, four hundred twenty thousand, four hundred four".