421245540 has 36 divisors (see below), whose sum is σ = 1277778684. Its totient is φ = 112332096.

The previous prime is 421245527. The next prime is 421245541. The reversal of 421245540 is 45542124.

It can be written as a sum of positive squares in 2 ways, for example, as 66977856 + 354267684 = 8184^2 + 18822^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (421245541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1169947 + ... + 1170306.

Almost surely, 2^421245540 is an apocalyptic number.

It is an amenable number.

421245540 is an abundant number, since it is smaller than the sum of its proper divisors (856533144).

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

421245540 is a wasteful number, since it uses less digits than its factorization.

421245540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340268 (or 2340263 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 421245540 is about 20524.2671001914. The cubic root of 421245540 is about 749.6268009941.

Adding to 421245540 its reverse (45542124), we get a palindrome (466787664).

The spelling of 421245540 in words is "four hundred twenty-one million, two hundred forty-five thousand, five hundred forty".