2155448740 has 12 divisors (see below), whose sum is σ = 4526442396. Its totient is φ = 862179488.

The previous prime is 2155448723. The next prime is 2155448753. The reversal of 2155448740 is 478445512.

It can be written as a sum of positive squares in 2 ways, for example, as 625700196 + 1529748544 = 25014^2 + 39112^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2155448693 and 2155448702.

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, 53886199 + ... + 53886238.

It is an arithmetic number, because the mean of its divisors is an integer number (377203533).

Almost surely, 2^2155448740 is an apocalyptic number.

2155448740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155448740 is an abundant number, since it is smaller than the sum of its proper divisors (2370993656).

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

2155448740 is a wasteful number, since it uses less digits than its factorization.

2155448740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107772446 (or 107772444 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 40.

The square root of 2155448740 is about 46426.8105732022. The cubic root of 2155448740 is about 1291.7522688926.

The spelling of 2155448740 in words is "two billion, one hundred fifty-five million, four hundred forty-eight thousand, seven hundred forty".