1947075128 has 8 divisors (see below), whose sum is σ = 3650765880. Its totient is φ = 973537560.

The previous prime is 1947075121. The next prime is 1947075197. The reversal of 1947075128 is 8215707491.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1947075128² = 7582203108152432768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947075121) by changing a digit.

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 as a sum of consecutive naturals, namely, 121692188 + ... + 121692203.

It is an arithmetic number, because the mean of its divisors is an integer number (456345735).

Almost surely, 2^1947075128 is an apocalyptic number.

It is an amenable number.

1947075128 is a deficient number, since it is larger than the sum of its proper divisors (1703690752).

1947075128 is a wasteful number, since it uses less digits than its factorization.

1947075128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243384397 (or 243384393 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 1947075128 is about 44125.6742498061. The cubic root of 1947075128 is about 1248.7080257421.

The spelling of 1947075128 in words is "one billion, nine hundred forty-seven million, seventy-five thousand, one hundred twenty-eight".