1309380187950 has 72 divisors (see below), whose sum is σ = 3518313201936. Its totient is φ = 349123872000.

The previous prime is 1309380187939. The next prime is 1309380187957. The reversal of 1309380187950 is 597810839031.

1309380187950 is a `hidden beast` number, since 1 + 30 + 9 + 380 + 187 + 9 + 50 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309380187957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3456415 + ... + 3816485.

It is an arithmetic number, because the mean of its divisors is an integer number (48865461138).

Almost surely, 2^{1309380187950} is an apocalyptic number.

1309380187950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1309380187950 is an abundant number, since it is smaller than the sum of its proper divisors (2208933013986).

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

1309380187950 is a wasteful number, since it uses less digits than its factorization.

1309380187950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368170 (or 368162 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 1309380187950 in words is "one trillion, three hundred nine billion, three hundred eighty million, one hundred eighty-seven thousand, nine hundred fifty".