1421024440 has 256 divisors, whose sum is σ = 3877632000. Its totient is φ = 463034880.

The previous prime is 1421024413. The next prime is 1421024471. The reversal of 1421024440 is 444201241.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21209287 + ... + 21209353.

It is an arithmetic number, because the mean of its divisors is an integer number (15147000).

Almost surely, 2^1421024440 is an apocalyptic number.

1421024440 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 1421024440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1938816000).

1421024440 is an abundant number, since it is smaller than the sum of its proper divisors (2456607560).

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

1421024440 is a wasteful number, since it uses less digits than its factorization.

1421024440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 1421024440 is about 37696.4778195523. The cubic root of 1421024440 is about 1124.2610956964.

Adding to 1421024440 its reverse (444201241), we get a palindrome (1865225681).

The spelling of 1421024440 in words is "one billion, four hundred twenty-one million, twenty-four thousand, four hundred forty".