1321490280 has 128 divisors (see below), whose sum is σ = 4552588800. Its totient is φ = 303494400.

The previous prime is 1321490279. The next prime is 1321490281. The reversal of 1321490280 is 820941231.

It is an interprime number because it is at equal distance from previous prime (1321490279) and next prime (1321490281).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1321490281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1266 + ... + 51425.

It is an arithmetic number, because the mean of its divisors is an integer number (35567100).

Almost surely, 2^1321490280 is an apocalyptic number.

1321490280 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 1321490280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2276294400).

1321490280 is an abundant number, since it is smaller than the sum of its proper divisors (3231098520).

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

1321490280 is a wasteful number, since it uses less digits than its factorization.

1321490280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52735 (or 52731 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1321490280 is about 36352.3077671831. The cubic root of 1321490280 is about 1097.3739783313.

The spelling of 1321490280 in words is "one billion, three hundred twenty-one million, four hundred ninety thousand, two hundred eighty".