1421632240 has 80 divisors (see below), whose sum is σ = 3786329088. Its totient is φ = 486275328.

The previous prime is 1421632213. The next prime is 1421632253. The reversal of 1421632240 is 422361241.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256539 + ... + 262021.

Almost surely, 2^1421632240 is an apocalyptic number.

1421632240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421632240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1893164544).

1421632240 is an abundant number, since it is smaller than the sum of its proper divisors (2364696848).

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

1421632240 is a wasteful number, since it uses less digits than its factorization.

1421632240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5966 (or 5960 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1421632240 is about 37704.5387188333. The cubic root of 1421632240 is about 1124.4213623496.

Adding to 1421632240 its reverse (422361241), we get a palindrome (1843993481).

The spelling of 1421632240 in words is "one billion, four hundred twenty-one million, six hundred thirty-two thousand, two hundred forty".