1381688650 has 12 divisors (see below), whose sum is σ = 2569940982. Its totient is φ = 552675440.

The previous prime is 1381688621. The next prime is 1381688663. The reversal of 1381688650 is 568861831.

It can be written as a sum of positive squares in 3 ways, for example, as 1086295681 + 295392969 = 32959^2 + 17187^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1381688650.

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, 13816837 + ... + 13816936.

Almost surely, 2^1381688650 is an apocalyptic number.

1381688650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1381688650 is a deficient number, since it is larger than the sum of its proper divisors (1188252332).

1381688650 is a wasteful number, since it uses less digits than its factorization.

1381688650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27633785 (or 27633780 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 1381688650 is about 37171.0727582619. The cubic root of 1381688650 is about 1113.7902112291.

The spelling of 1381688650 in words is "one billion, three hundred eighty-one million, six hundred eighty-eight thousand, six hundred fifty".