1948138540 has 24 divisors (see below), whose sum is σ = 4091959872. Its totient is φ = 779089920.

The previous prime is 1948138483. The next prime is 1948138547. The reversal of 1948138540 is 458318491.

It is not an unprimeable number, because it can be changed into a prime (1948138547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138220 + ... + 151660.

It is an arithmetic number, because the mean of its divisors is an integer number (170498328).

Almost surely, 2^1948138540 is an apocalyptic number.

1948138540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1948138540 is an abundant number, since it is smaller than the sum of its proper divisors (2143821332).

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

1948138540 is a wasteful number, since it uses less digits than its factorization.

1948138540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20697 (or 20695 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 1948138540 is about 44137.7224151859. The cubic root of 1948138540 is about 1248.9353152813.

The spelling of 1948138540 in words is "one billion, nine hundred forty-eight million, one hundred thirty-eight thousand, five hundred forty".