1825868221 has 8 divisors (see below), whose sum is σ = 1966040640. Its totient is φ = 1689336768.

The previous prime is 1825868171. The next prime is 1825868227. The reversal of 1825868221 is 1228685281.

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

It is a cyclic number.

It is not a de Polignac number, because 1825868221 - 2⁹ = 1825867709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1825868227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 909201 + ... + 911206.

It is an arithmetic number, because the mean of its divisors is an integer number (245755080).

Almost surely, 2^1825868221 is an apocalyptic number.

It is an amenable number.

1825868221 is a deficient number, since it is larger than the sum of its proper divisors (140172419).

1825868221 is a wasteful number, since it uses less digits than its factorization.

1825868221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820483.

The product of its digits is 122880, while the sum is 43.

The square root of 1825868221 is about 42730.1792764786. The cubic root of 1825868221 is about 1222.2399547807.

The spelling of 1825868221 in words is "one billion, eight hundred twenty-five million, eight hundred sixty-eight thousand, two hundred twenty-one".