1721040855 has 16 divisors (see below), whose sum is σ = 2754595680. Its totient is φ = 917578368.

The previous prime is 1721040851. The next prime is 1721040863. The reversal of 1721040855 is 5580401271.

It is not a de Polignac number, because 1721040855 - 2² = 1721040851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721040851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30669 + ... + 66201.

It is an arithmetic number, because the mean of its divisors is an integer number (172162230).

Almost surely, 2^1721040855 is an apocalyptic number.

1721040855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1721040855 is a deficient number, since it is larger than the sum of its proper divisors (1033554825).

1721040855 is a wasteful number, since it uses less digits than its factorization.

1721040855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38770.

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 1721040855 is about 41485.4294301023. The cubic root of 1721040855 is about 1198.3869194197.

The spelling of 1721040855 in words is "one billion, seven hundred twenty-one million, forty thousand, eight hundred fifty-five".