420021404 has 12 divisors (see below), whose sum is σ = 801859128. Its totient is φ = 190918800.

The previous prime is 420021403. The next prime is 420021409. The reversal of 420021404 is 404120024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420021403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4772927 + ... + 4773014.

It is an arithmetic number, because the mean of its divisors is an integer number (66821594).

Almost surely, 2^420021404 is an apocalyptic number.

420021404 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

420021404 is a deficient number, since it is larger than the sum of its proper divisors (381837724).

420021404 is a wasteful number, since it uses less digits than its factorization.

420021404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9545956 (or 9545954 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 420021404 is about 20494.4237293953. The cubic root of 420021404 is about 748.8999600791.

Adding to 420021404 its reverse (404120024), we get a palindrome (824141428).

The spelling of 420021404 in words is "four hundred twenty million, twenty-one thousand, four hundred four".