1283630820 has 24 divisors (see below), whose sum is σ = 3594166464. Its totient is φ = 342301536.

The previous prime is 1283630807. The next prime is 1283630827. The reversal of 1283630820 is 280363821.

It is not an unprimeable number, because it can be changed into a prime (1283630827) by changing a digit.

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, 10696864 + ... + 10696983.

It is an arithmetic number, because the mean of its divisors is an integer number (149756936).

Almost surely, 2^1283630820 is an apocalyptic number.

1283630820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1283630820 is an abundant number, since it is smaller than the sum of its proper divisors (2310535644).

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

1283630820 is a wasteful number, since it uses less digits than its factorization.

1283630820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21393859 (or 21393857 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1283630820 is about 35827.7939594388. The cubic root of 1283630820 is about 1086.7926984856.

The spelling of 1283630820 in words is "one billion, two hundred eighty-three million, six hundred thirty thousand, eight hundred twenty".