1858840472449 has 3 divisors (see below), whose sum is σ = 1858841835843. Its totient is φ = 1858839109056.

The previous prime is 1858840472441. The next prime is 1858840472453. The reversal of 1858840472449 is 9442740488581.

The square root of 1858840472449 is 1363393.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 276860130625 + 1581980341824 = 526175^2 + 1257768^2 .

It is not a de Polignac number, because 1858840472449 - 2³ = 1858840472441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1858840472441) 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 2 ways as a sum of consecutive naturals, for example, 681697 + ... + 2045089.

It is an arithmetic number, because the mean of its divisors is an integer number (619613945281).

Almost surely, 2^{1858840472449} is an apocalyptic number.

1858840472449 is the 1363393-rd square number.

1858840472449 is the 681697-th centered octagonal number.

It is an amenable number.

1858840472449 is a deficient number, since it is larger than the sum of its proper divisors (1363394).

1858840472449 is an frugal number, since it uses more digits than its factorization.

1858840472449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726786 (or 1363393 counting only the distinct ones).

The product of its (nonzero) digits is 82575360, while the sum is 64.

Multiplying 1858840472449 by its sum of digits (64), we get a square (118965790236736 = 10907144²).

The spelling of 1858840472449 in words is "one trillion, eight hundred fifty-eight billion, eight hundred forty million, four hundred seventy-two thousand, four hundred forty-nine".