1280430900 has 324 divisors, whose sum is σ = 4849502112. Its totient is φ = 276773760.

The previous prime is 1280430883. The next prime is 1280430929. The reversal of 1280430900 is 90340821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2274019 + ... + 2274581.

Almost surely, 2^1280430900 is an apocalyptic number.

1280430900 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 1280430900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2424751056).

1280430900 is an abundant number, since it is smaller than the sum of its proper divisors (3569071212).

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

1280430900 is a wasteful number, since it uses less digits than its factorization.

1280430900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1280430900 is about 35783.1091438405. The cubic root of 1280430900 is about 1085.8888707344. Note that the first 4 decimals are identical.

The spelling of 1280430900 in words is "one billion, two hundred eighty million, four hundred thirty thousand, nine hundred".