1947208140 has 96 divisors (see below), whose sum is σ = 6069288960. Its totient is φ = 518286528.

The previous prime is 1947208117. The next prime is 1947208171. The reversal of 1947208140 is 418027491.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1947208095 and 1947208104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313909 + ... + 320051.

It is an arithmetic number, because the mean of its divisors is an integer number (63221760).

Almost surely, 2^1947208140 is an apocalyptic number.

1947208140 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 1947208140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3034644480).

1947208140 is an abundant number, since it is smaller than the sum of its proper divisors (4122080820).

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

1947208140 is a wasteful number, since it uses less digits than its factorization.

1947208140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6748 (or 6740 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1947208140 is about 44127.1814191661. The cubic root of 1947208140 is about 1248.7364597365.

The spelling of 1947208140 in words is "one billion, nine hundred forty-seven million, two hundred eight thousand, one hundred forty".