1947977913 has 16 divisors (see below), whose sum is σ = 2995583360. Its totient is φ = 1102916736.

The previous prime is 1947977909. The next prime is 1947977923. The reversal of 1947977913 is 3197797491.

1947977913 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1947977913 - 2² = 1947977909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1947977923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423220 + ... + 427797.

It is an arithmetic number, because the mean of its divisors is an integer number (187223960).

Almost surely, 2^1947977913 is an apocalyptic number.

It is an amenable number.

1947977913 is a deficient number, since it is larger than the sum of its proper divisors (1047605447).

1947977913 is a wasteful number, since it uses less digits than its factorization.

1947977913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851136.

The product of its digits is 3000564, while the sum is 57.

The square root of 1947977913 is about 44135.9027663421. The cubic root of 1947977913 is about 1248.9009887960.

The spelling of 1947977913 in words is "one billion, nine hundred forty-seven million, nine hundred seventy-seven thousand, nine hundred thirteen".