420405544 has 32 divisors (see below), whose sum is σ = 871846920. Its totient is φ = 188787456.

The previous prime is 420405527. The next prime is 420405551. The reversal of 420405544 is 445504024.

It can be written as a sum of positive squares in 4 ways, for example, as 352012644 + 68392900 = 18762^2 + 8270^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50779 + ... + 58474.

Almost surely, 2^420405544 is an apocalyptic number.

It is an amenable number.

420405544 is an abundant number, since it is smaller than the sum of its proper divisors (451441376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420405544 is a wasteful number, since it uses less digits than its factorization.

420405544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109309 (or 109305 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

The square root of 420405544 is about 20503.7934051238. The cubic root of 420405544 is about 749.1281982676.

Adding to 420405544 its reverse (445504024), we get a palindrome (865909568).

The spelling of 420405544 in words is "four hundred twenty million, four hundred five thousand, five hundred forty-four".