1979662369 has 4 divisors (see below), whose sum is σ = 1998882496. Its totient is φ = 1960442244.

The previous prime is 1979662331. The next prime is 1979662381. The reversal of 1979662369 is 9632669791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1979662369 - 2⁹ = 1979661857 is a prime.

It is a super-2 number, since 2×1979662369² = 7838126190469384322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1979662309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9609909 + ... + 9610114.

It is an arithmetic number, because the mean of its divisors is an integer number (499720624).

Almost surely, 2^1979662369 is an apocalyptic number.

It is an amenable number.

1979662369 is a deficient number, since it is larger than the sum of its proper divisors (19220127).

1979662369 is a wasteful number, since it uses less digits than its factorization.

1979662369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19220126.

The product of its digits is 6613488, while the sum is 58.

The square root of 1979662369 is about 44493.3969145985. The cubic root of 1979662369 is about 1255.6358568913.

The spelling of 1979662369 in words is "one billion, nine hundred seventy-nine million, six hundred sixty-two thousand, three hundred sixty-nine".