2148391540 has 24 divisors (see below), whose sum is σ = 4538644992. Its totient is φ = 854209440.

The previous prime is 2148391501. The next prime is 2148391561. The reversal of 2148391540 is 451938412.

It is a self number, because there is not a number n which added to its sum of digits gives 2148391540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318276 + ... + 324955.

It is an arithmetic number, because the mean of its divisors is an integer number (189110208).

Almost surely, 2^2148391540 is an apocalyptic number.

2148391540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2148391540 is an abundant number, since it is smaller than the sum of its proper divisors (2390253452).

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

2148391540 is a wasteful number, since it uses less digits than its factorization.

2148391540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643407 (or 643405 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 2148391540 is about 46350.7447620855. The cubic root of 2148391540 is about 1290.3409430730.

The spelling of 2148391540 in words is "two billion, one hundred forty-eight million, three hundred ninety-one thousand, five hundred forty".