1381691500 has 96 divisors (see below), whose sum is σ = 3507678720. Its totient is φ = 465624000.

The previous prime is 1381691471. The next prime is 1381691537. The reversal of 1381691500 is 51961831.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203155 + ... + 209845.

It is an arithmetic number, because the mean of its divisors is an integer number (36538320).

Almost surely, 2^1381691500 is an apocalyptic number.

1381691500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381691500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1753839360).

1381691500 is an abundant number, since it is smaller than the sum of its proper divisors (2125987220).

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

1381691500 is a wasteful number, since it uses less digits than its factorization.

1381691500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6776 (or 6764 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1381691500 is about 37171.1110945046. Note that the first 3 decimals coincide. The cubic root of 1381691500 is about 1113.7909770311.

The spelling of 1381691500 in words is "one billion, three hundred eighty-one million, six hundred ninety-one thousand, five hundred".