1926638978879 has 8 divisors (see below), whose sum is σ = 1930442806128. Its totient is φ = 1922837978880.

The previous prime is 1926638978851. The next prime is 1926638978881. The reversal of 1926638978879 is 9788798366291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1926638978879 - 2⁸ = 1926638978623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1926638978797 and 1926638978806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1926638978809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660044 + ... + 2070974.

It is an arithmetic number, because the mean of its divisors is an integer number (241305350766).

Almost surely, 2^{1926638978879} is an apocalyptic number.

1926638978879 is a deficient number, since it is larger than the sum of its proper divisors (3803827249).

1926638978879 is a wasteful number, since it uses less digits than its factorization.

1926638978879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413625.

The product of its digits is 3950456832, while the sum is 83.

The spelling of 1926638978879 in words is "one trillion, nine hundred twenty-six billion, six hundred thirty-eight million, nine hundred seventy-eight thousand, eight hundred seventy-nine".