1979394065 has 64 divisors (see below), whose sum is σ = 2932899840. Its totient is φ = 1263651840.

The previous prime is 1979394041. The next prime is 1979394071. The reversal of 1979394065 is 5604939791.

It is a happy number.

It is not a de Polignac number, because 1979394065 - 2²² = 1975199761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1979393998 and 1979394016.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1189424 + ... + 1191086.

It is an arithmetic number, because the mean of its divisors is an integer number (45826560).

Almost surely, 2^1979394065 is an apocalyptic number.

It is an amenable number.

1979394065 is a deficient number, since it is larger than the sum of its proper divisors (953505775).

1979394065 is a wasteful number, since it uses less digits than its factorization.

1979394065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The square root of 1979394065 is about 44490.3817133546. The cubic root of 1979394065 is about 1255.5791288100.

The spelling of 1979394065 in words is "one billion, nine hundred seventy-nine million, three hundred ninety-four thousand, sixty-five".