1979478513 has 16 divisors (see below), whose sum is σ = 2954952000. Its totient is φ = 1309576320.

The previous prime is 1979478511. The next prime is 1979478533. The reversal of 1979478513 is 3158749791.

It is a happy number.

1979478513 is a `hidden beast` number, since 19 + 79 + 47 + 8 + 513 = 666.

It is not a de Polignac number, because 1979478513 - 2¹ = 1979478511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1979478513.

It is not an unprimeable number, because it can be changed into a prime (1979478511) 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, 276288 + ... + 283361.

It is an arithmetic number, because the mean of its divisors is an integer number (184684500).

Almost surely, 2^1979478513 is an apocalyptic number.

It is an amenable number.

1979478513 is a deficient number, since it is larger than the sum of its proper divisors (975473487).

1979478513 is a wasteful number, since it uses less digits than its factorization.

1979478513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559789 (or 559783 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 1979478513 is about 44491.3307622957. The cubic root of 1979478513 is about 1255.5969843817.

The spelling of 1979478513 in words is "one billion, nine hundred seventy-nine million, four hundred seventy-eight thousand, five hundred thirteen".