2169859540 has 24 divisors (see below), whose sum is σ = 4558475880. Its totient is φ = 867606528.

The previous prime is 2169859529. The next prime is 2169859553. The reversal of 2169859540 is 459589612.

It can be written as a sum of positive squares in 4 ways, for example, as 696220996 + 1473638544 = 26386^2 + 38388^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35356 + ... + 74764.

It is an arithmetic number, because the mean of its divisors is an integer number (189936495).

Almost surely, 2^2169859540 is an apocalyptic number.

2169859540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2169859540 is an abundant number, since it is smaller than the sum of its proper divisors (2388616340).

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

2169859540 is a wasteful number, since it uses less digits than its factorization.

2169859540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42171 (or 42169 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The square root of 2169859540 is about 46581.7511478476. The cubic root of 2169859540 is about 1294.6246563056.

The spelling of 2169859540 in words is "two billion, one hundred sixty-nine million, eight hundred fifty-nine thousand, five hundred forty".