1000800280 has 32 divisors (see below), whose sum is σ = 2324442240. Its totient is φ = 387406080.

The previous prime is 1000800257. The next prime is 1000800323. The reversal of 1000800280 is 820080001.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402309 + ... + 404788.

It is an arithmetic number, because the mean of its divisors is an integer number (72638820).

Almost surely, 2^1000800280 is an apocalyptic number.

1000800280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000800280 is an abundant number, since it is smaller than the sum of its proper divisors (1323641960).

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

1000800280 is a wasteful number, since it uses less digits than its factorization.

1000800280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807139 (or 807135 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 1000800280 is about 31635.4276089324. The cubic root of 1000800280 is about 1000.2666888707.

Adding to 1000800280 its reverse (820080001), we get a palindrome (1820880281).

The spelling of 1000800280 in words is "one billion, eight hundred thousand, two hundred eighty".