2178723436 has 12 divisors (see below), whose sum is σ = 3905760600. Its totient is φ = 1062791840.

The previous prime is 2178723409. The next prime is 2178723473. The reversal of 2178723436 is 6343278712.

2178723436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2178723392 and 2178723401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6642286 + ... + 6642613.

It is an arithmetic number, because the mean of its divisors is an integer number (325480050).

Almost surely, 2^2178723436 is an apocalyptic number.

It is an amenable number.

2178723436 is a deficient number, since it is larger than the sum of its proper divisors (1727037164).

2178723436 is a wasteful number, since it uses less digits than its factorization.

2178723436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13284944 (or 13284942 counting only the distinct ones).

The product of its digits is 338688, while the sum is 43.

The square root of 2178723436 is about 46676.7976193740. The cubic root of 2178723436 is about 1296.3851124914.

The spelling of 2178723436 in words is "two billion, one hundred seventy-eight million, seven hundred twenty-three thousand, four hundred thirty-six".