1421297280 has 768 divisors, whose sum is σ = 5925628800. Its totient is φ = 322486272.

The previous prime is 1421297239. The next prime is 1421297287. The reversal of 1421297280 is 827921241.

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

It is not an unprimeable number, because it can be changed into a prime (1421297287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 38413422 + ... + 38413458.

Almost surely, 2^1421297280 is an apocalyptic number.

1421297280 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 1421297280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2962814400).

1421297280 is an abundant number, since it is smaller than the sum of its proper divisors (4504331520).

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

1421297280 is a wasteful number, since it uses less digits than its factorization.

1421297280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1421297280 is about 37700.0965516005. The cubic root of 1421297280 is about 1124.3330446742. Note that the first 3 decimals are identical.

The spelling of 1421297280 in words is "one billion, four hundred twenty-one million, two hundred ninety-seven thousand, two hundred eighty".