1283723838 has 12 divisors (see below), whose sum is σ = 2781401688. Its totient is φ = 427907940.

The previous prime is 1283723821. The next prime is 1283723869. The reversal of 1283723838 is 8383273821.

It is a junction number, because it is equal to n+sod(n) for n = 1283723793 and 1283723802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35658978 + ... + 35659013.

It is an arithmetic number, because the mean of its divisors is an integer number (231783474).

Almost surely, 2^1283723838 is an apocalyptic number.

1283723838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1283723838 is an abundant number, since it is smaller than the sum of its proper divisors (1497677850).

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

1283723838 is a wasteful number, since it uses less digits than its factorization.

1283723838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71317999 (or 71317996 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 1283723838 is about 35829.0920621776. The cubic root of 1283723838 is about 1086.8189492425.

The spelling of 1283723838 in words is "one billion, two hundred eighty-three million, seven hundred twenty-three thousand, eight hundred thirty-eight".