12346779378 has 16 divisors (see below), whose sum is σ = 24713764416. Its totient is φ = 4112225520.

The previous prime is 12346779331. The next prime is 12346779409. The reversal of 12346779378 is 87397764321.

It is a happy number.

It is a super-2 number, since 2×12346779378² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 833953 + ... + 848628.

It is an arithmetic number, because the mean of its divisors is an integer number (1544610276).

Almost surely, 2^12346779378 is an apocalyptic number.

12346779378 is an abundant number, since it is smaller than the sum of its proper divisors (12366985038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12346779378 is a wasteful number, since it uses less digits than its factorization.

12346779378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683809.

The product of its digits is 10668672, while the sum is 57.

The spelling of 12346779378 in words is "twelve billion, three hundred forty-six million, seven hundred seventy-nine thousand, three hundred seventy-eight".