2155684944 has 160 divisors (see below), whose sum is σ = 6723887104. Its totient is φ = 582059520.

The previous prime is 2155684897. The next prime is 2155684961. The reversal of 2155684944 is 4494865512.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 2155684893 and 2155684902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 445482 + ... + 450294.

Almost surely, 2^2155684944 is an apocalyptic number.

2155684944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155684944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3361943552).

2155684944 is an abundant number, since it is smaller than the sum of its proper divisors (4568202160).

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

2155684944 is a wasteful number, since it uses less digits than its factorization.

2155684944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4905 (or 4899 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 48.

The square root of 2155684944 is about 46429.3543353771. The cubic root of 2155684944 is about 1291.7994525568.

The spelling of 2155684944 in words is "two billion, one hundred fifty-five million, six hundred eighty-four thousand, nine hundred forty-four".