1231433280 has 560 divisors, whose sum is σ = 5470160256. Its totient is φ = 255467520.

The previous prime is 1231433221. The next prime is 1231433303. The reversal of 1231433280 is 823341321.

1231433280 is a `hidden beast` number, since 12 + 314 + 332 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1995532 + ... + 1996148.

Almost surely, 2^1231433280 is an apocalyptic number.

1231433280 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 1231433280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2735080128).

1231433280 is an abundant number, since it is smaller than the sum of its proper divisors (4238726976).

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

1231433280 is a wasteful number, since it uses less digits than its factorization.

1231433280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1231433280 is about 35091.7836537273. The cubic root of 1231433280 is about 1071.8572803243.

The spelling of 1231433280 in words is "one billion, two hundred thirty-one million, four hundred thirty-three thousand, two hundred eighty".