1283423720 has 32 divisors (see below), whose sum is σ = 2891337120. Its totient is φ = 512723520.

The previous prime is 1283423693. The next prime is 1283423741. The reversal of 1283423720 is 273243821.

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, 12659 + ... + 52221.

It is an arithmetic number, because the mean of its divisors is an integer number (90354285).

Almost surely, 2^1283423720 is an apocalyptic number.

1283423720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1283423720 is an abundant number, since it is smaller than the sum of its proper divisors (1607913400).

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

1283423720 is a wasteful number, since it uses less digits than its factorization.

1283423720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40385 (or 40381 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 1283423720 is about 35824.9036286212. The cubic root of 1283423720 is about 1086.7342479120.

The spelling of 1283423720 in words is "one billion, two hundred eighty-three million, four hundred twenty-three thousand, seven hundred twenty".