1285283138 has 4 divisors (see below), whose sum is σ = 1927924710. Its totient is φ = 642641568.

The previous prime is 1285283123. The next prime is 1285283141. The reversal of 1285283138 is 8313825821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1118434249 + 166848889 = 33443^2 + 12917^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1285283095 and 1285283104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321320783 + ... + 321320786.

Almost surely, 2^1285283138 is an apocalyptic number.

1285283138 is a deficient number, since it is larger than the sum of its proper divisors (642641572).

1285283138 is an equidigital number, since it uses as much as digits as its factorization.

1285283138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642641571.

The product of its digits is 92160, while the sum is 41.

The square root of 1285283138 is about 35850.8457082954. The cubic root of 1285283138 is about 1087.2588130830.

The spelling of 1285283138 in words is "one billion, two hundred eighty-five million, two hundred eighty-three thousand, one hundred thirty-eight".