421516240 has 20 divisors (see below), whose sum is σ = 980025444. Its totient is φ = 168606464.

The previous prime is 421516231. The next prime is 421516243. The reversal of 421516240 is 42615124.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 193989184 + 227527056 = 13928^2 + 15084^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421516243) 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, 2634397 + ... + 2634556.

Almost surely, 2^421516240 is an apocalyptic number.

421516240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421516240 is an abundant number, since it is smaller than the sum of its proper divisors (558509204).

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

421516240 is a wasteful number, since it uses less digits than its factorization.

421516240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268966 (or 5268960 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 421516240 is about 20530.8606736298. The cubic root of 421516240 is about 749.7873411888.

The spelling of 421516240 in words is "four hundred twenty-one million, five hundred sixteen thousand, two hundred forty".