1421937720 has 256 divisors, whose sum is σ = 5463244800. Its totient is φ = 322237440.

The previous prime is 1421937709. The next prime is 1421937739. The reversal of 1421937720 is 277391241.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 959380 + ... + 960860.

It is an arithmetic number, because the mean of its divisors is an integer number (21340800).

Almost surely, 2^1421937720 is an apocalyptic number.

1421937720 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 1421937720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2731622400).

1421937720 is an abundant number, since it is smaller than the sum of its proper divisors (4041307080).

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

1421937720 is a wasteful number, since it uses less digits than its factorization.

1421937720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635 (or 1625 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 1421937720 is about 37708.5894724266. The cubic root of 1421937720 is about 1124.5018950472.

The spelling of 1421937720 in words is "one billion, four hundred twenty-one million, nine hundred thirty-seven thousand, seven hundred twenty".