1273842820 has 12 divisors (see below), whose sum is σ = 2675069964. Its totient is φ = 509537120.

The previous prime is 1273842803. The next prime is 1273842839. The reversal of 1273842820 is 282483721.

It can be written as a sum of positive squares in 2 ways, for example, as 363131136 + 910711684 = 19056^2 + 30178^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1273842820.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31846051 + ... + 31846090.

It is an arithmetic number, because the mean of its divisors is an integer number (222922497).

Almost surely, 2^1273842820 is an apocalyptic number.

1273842820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273842820 is an abundant number, since it is smaller than the sum of its proper divisors (1401227144).

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

1273842820 is a wasteful number, since it uses less digits than its factorization.

1273842820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63692150 (or 63692148 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 1273842820 is about 35690.9347033669. The cubic root of 1273842820 is about 1084.0232937084.

The spelling of 1273842820 in words is "one billion, two hundred seventy-three million, eight hundred forty-two thousand, eight hundred twenty".