421404140 has 24 divisors (see below), whose sum is σ = 886319280. Its totient is φ = 168300608.

The previous prime is 421404121. The next prime is 421404149. The reversal of 421404140 is 41404124.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (421404149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2807 + ... + 29166.

It is an arithmetic number, because the mean of its divisors is an integer number (36929970).

Almost surely, 2^421404140 is an apocalyptic number.

It is an amenable number.

421404140 is an abundant number, since it is smaller than the sum of its proper divisors (464915140).

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

421404140 is a wasteful number, since it uses less digits than its factorization.

421404140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32641 (or 32639 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 421404140 is about 20528.1304555481. The cubic root of 421404140 is about 749.7208679785.

Adding to 421404140 its reverse (41404124), we get a palindrome (462808264).

The spelling of 421404140 in words is "four hundred twenty-one million, four hundred four thousand, one hundred forty".