1231280320 has 56 divisors (see below), whose sum is σ = 3026590848. Its totient is φ = 476620800.

The previous prime is 1231280317. The next prime is 1231280353. The reversal of 1231280320 is 230821321.

It is a super-3 number, since 3×1231280320³ (a number of 28 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1231280291 and 1231280300.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 52141 + ... + 71980.

Almost surely, 2^1231280320 is an apocalyptic number.

1231280320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231280320 is an abundant number, since it is smaller than the sum of its proper divisors (1795310528).

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

1231280320 is a wasteful number, since it uses less digits than its factorization.

1231280320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124169 (or 124159 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1231280320 is about 35089.6041584969. The cubic root of 1231280320 is about 1071.8128989569.

The spelling of 1231280320 in words is "one billion, two hundred thirty-one million, two hundred eighty thousand, three hundred twenty".