1947138464 has 12 divisors (see below), whose sum is σ = 3833428914. Its totient is φ = 973569216.

The previous prime is 1947138463. The next prime is 1947138467. The reversal of 1947138464 is 4648317491.

It can be written as a sum of positive squares in only one way, i.e., 1566576400 + 380562064 = 39580^2 + 19508^2 .

It is not an unprimeable number, because it can be changed into a prime (1947138461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30424007 + ... + 30424070.

Almost surely, 2^1947138464 is an apocalyptic number.

It is an amenable number.

1947138464 is a deficient number, since it is larger than the sum of its proper divisors (1886290450).

1947138464 is an equidigital number, since it uses as much as digits as its factorization.

1947138464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60848087 (or 60848079 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The square root of 1947138464 is about 44126.3919213887. The cubic root of 1947138464 is about 1248.7215652494.

The spelling of 1947138464 in words is "one billion, nine hundred forty-seven million, one hundred thirty-eight thousand, four hundred sixty-four".