1938121 has 4 divisors (see below), whose sum is σ = 1940992. Its totient is φ = 1935252.

The previous prime is 1938113. The next prime is 1938149. The reversal of 1938121 is 1218391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1938121 - 2³ = 1938113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938161) 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, 196 + ... + 1978.

It is an arithmetic number, because the mean of its divisors is an integer number (485248).

2^1938121 is an apocalyptic number.

It is an amenable number.

1938121 is a deficient number, since it is larger than the sum of its proper divisors (2871).

1938121 is a wasteful number, since it uses less digits than its factorization.

1938121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870.

The product of its digits is 432, while the sum is 25.

The square root of 1938121 is about 1392.1641426211. The cubic root of 1938121 is about 124.6790915136.

The spelling of 1938121 in words is "one million, nine hundred thirty-eight thousand, one hundred twenty-one".