420005444 has 6 divisors (see below), whose sum is σ = 735009534. Its totient is φ = 210002720.

The previous prime is 420005437. The next prime is 420005447. The reversal of 420005444 is 444500024.

It can be written as a sum of positive squares in only one way, i.e., 385336900 + 34668544 = 19630^2 + 5888^2 .

It is not an unprimeable number, because it can be changed into a prime (420005447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52500677 + ... + 52500684.

It is an arithmetic number, because the mean of its divisors is an integer number (122501589).

Almost surely, 2^420005444 is an apocalyptic number.

It is an amenable number.

420005444 is a deficient number, since it is larger than the sum of its proper divisors (315004090).

420005444 is a wasteful number, since it uses less digits than its factorization.

420005444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105001365 (or 105001363 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 420005444 is about 20494.0343514887. The cubic root of 420005444 is about 748.8904743762.

Adding to 420005444 its reverse (444500024), we get a palindrome (864505468).

The spelling of 420005444 in words is "four hundred twenty million, five thousand, four hundred forty-four".