1845486721 has 8 divisors (see below), whose sum is σ = 1991269224. Its totient is φ = 1700250240.

The previous prime is 1845486707. The next prime is 1845486743. The reversal of 1845486721 is 1276845481.

It can be written as a sum of positive squares in 4 ways, for example, as 166126321 + 1679360400 = 12889^2 + 40980^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1845486721 - 2⁷ = 1845486593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1845486781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129466 + ... + 143011.

It is an arithmetic number, because the mean of its divisors is an integer number (248908653).

Almost surely, 2^1845486721 is an apocalyptic number.

It is an amenable number.

1845486721 is a deficient number, since it is larger than the sum of its proper divisors (145782503).

1845486721 is a wasteful number, since it uses less digits than its factorization.

1845486721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273011.

The product of its digits is 430080, while the sum is 46.

The square root of 1845486721 is about 42959.1284944190. The cubic root of 1845486721 is about 1226.6019239207.

It can be divided in two parts, 1845 and 486721, that added together give a triangular number (488566 = T₉₈₈).

The spelling of 1845486721 in words is "one billion, eight hundred forty-five million, four hundred eighty-six thousand, seven hundred twenty-one".