1850921 has 4 divisors (see below), whose sum is σ = 1853700. Its totient is φ = 1848144.

The previous prime is 1850887. The next prime is 1850939. The reversal of 1850921 is 1290581.

It is a happy 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 2 ways, for example, as 384400 + 1466521 = 620^2 + 1211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1850921 - 2¹⁸ = 1588777 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1850941) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 275 + ... + 1943.

It is an arithmetic number, because the mean of its divisors is an integer number (463425).

2^1850921 is an apocalyptic number.

It is an amenable number.

1850921 is a deficient number, since it is larger than the sum of its proper divisors (2779).

1850921 is a wasteful number, since it uses less digits than its factorization.

1850921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1850921 is about 1360.4855750797. The cubic root of 1850921 is about 122.7804707809.

The spelling of 1850921 in words is "one million, eight hundred fifty thousand, nine hundred twenty-one".