421232240 has 80 divisors (see below), whose sum is σ = 1150613856. Its totient is φ = 141388800.

The previous prime is 421232233. The next prime is 421232249. The reversal of 421232240 is 42232124.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421232249) 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, 6971 + ... + 29850.

Almost surely, 2^421232240 is an apocalyptic number.

421232240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421232240 is an abundant number, since it is smaller than the sum of its proper divisors (729381616).

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

421232240 is a wasteful number, since it uses less digits than its factorization.

421232240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36858 (or 36852 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421232240 is about 20523.9430909365. The cubic root of 421232240 is about 749.6189115801.

Adding to 421232240 its reverse (42232124), we get a palindrome (463464364).

The spelling of 421232240 in words is "four hundred twenty-one million, two hundred thirty-two thousand, two hundred forty".