1927939540 has 24 divisors (see below), whose sum is σ = 4049540712. Its totient is φ = 771010560.

The previous prime is 1927939523. The next prime is 1927939543. The reversal of 1927939540 is 459397291.

It can be written as a sum of positive squares in 4 ways, for example, as 190550416 + 1737389124 = 13804^2 + 41682^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1927939543) 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, 135652 + ... + 149188.

It is an arithmetic number, because the mean of its divisors is an integer number (168730863).

Almost surely, 2^1927939540 is an apocalyptic number.

1927939540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1927939540 is an abundant number, since it is smaller than the sum of its proper divisors (2121601172).

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

1927939540 is a wasteful number, since it uses less digits than its factorization.

1927939540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20667 (or 20665 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 1927939540 is about 43908.3083254183. The cubic root of 1927939540 is about 1244.6038405580.

The spelling of 1927939540 in words is "one billion, nine hundred twenty-seven million, nine hundred thirty-nine thousand, five hundred forty".