1938421 has 4 divisors (see below), whose sum is σ = 1979712. Its totient is φ = 1897132.

The previous prime is 1938383. The next prime is 1938427. The reversal of 1938421 is 1248391.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1938421 - 2¹⁵ = 1905653 is a prime.

It is a Duffinian number.

1938421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1938421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20575 + ... + 20668.

It is an arithmetic number, because the mean of its divisors is an integer number (494928).

2^1938421 is an apocalyptic number.

It is an amenable number.

1938421 is a deficient number, since it is larger than the sum of its proper divisors (41291).

1938421 is an equidigital number, since it uses as much as digits as its factorization.

1938421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41290.

The product of its digits is 1728, while the sum is 28.

The square root of 1938421 is about 1392.2718843674. The cubic root of 1938421 is about 124.6855241698.

The spelling of 1938421 in words is "one million, nine hundred thirty-eight thousand, four hundred twenty-one".