1938490 has 16 divisors (see below), whose sum is σ = 3515400. Its totient is φ = 769600.

The previous prime is 1938451. The next prime is 1938491. The reversal of 1938490 is 948391.

It can be written as a sum of positive squares in 4 ways, for example, as 471969 + 1466521 = 687^2 + 1211^2 .

It is not an unprimeable number, because it can be changed into a prime (1938491) 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 7 ways as a sum of consecutive naturals, for example, 840 + ... + 2140.

2^1938490 is an apocalyptic number.

1938490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1938490 is a deficient number, since it is larger than the sum of its proper divisors (1576910).

1938490 is a wasteful number, since it uses less digits than its factorization.

1938490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1938490 is about 1392.2966637897. The cubic root of 1938490 is about 124.6870035868.

Subtracting from 1938490 its reverse (948391), we obtain a palindrome (990099).

The spelling of 1938490 in words is "one million, nine hundred thirty-eight thousand, four hundred ninety".