2169279840 has 192 divisors, whose sum is σ = 8410300416. Its totient is φ = 457684992.

The previous prime is 2169279823. The next prime is 2169279851. The reversal of 2169279840 is 489729612.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 2169279840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18849 + ... + 68511.

It is an arithmetic number, because the mean of its divisors is an integer number (43803648).

Almost surely, 2^2169279840 is an apocalyptic number.

2169279840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2169279840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4205150208).

2169279840 is an abundant number, since it is smaller than the sum of its proper divisors (6241020576).

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

2169279840 is a wasteful number, since it uses less digits than its factorization.

2169279840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49701 (or 49693 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 2169279840 is about 46575.5283383882. The cubic root of 2169279840 is about 1294.5093553313.

The spelling of 2169279840 in words is "two billion, one hundred sixty-nine million, two hundred seventy-nine thousand, eight hundred forty".