421240440 has 64 divisors (see below), whose sum is σ = 1265709600. Its totient is φ = 112154112.

The previous prime is 421240429. The next prime is 421240447. The reversal of 421240440 is 44042124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421240447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85566 + ... + 90354.

Almost surely, 2^421240440 is an apocalyptic number.

421240440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421240440 is an abundant number, since it is smaller than the sum of its proper divisors (844469160).

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

421240440 is a wasteful number, since it uses less digits than its factorization.

421240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536 (or 5532 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 421240440 is about 20524.1428566457. The cubic root of 421240440 is about 749.6237757498.

Adding to 421240440 its reverse (44042124), we get a palindrome (465282564).

The spelling of 421240440 in words is "four hundred twenty-one million, two hundred forty thousand, four hundred forty".