1938491 has 2 divisors, whose sum is σ = 1938492. Its totient is φ = 1938490.

The previous prime is 1938451. The next prime is 1938499. The reversal of 1938491 is 1948391.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1938491 - 2⁶ = 1938427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1938499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969245 + 969246.

It is an arithmetic number, because the mean of its divisors is an integer number (969246).

2^1938491 is an apocalyptic number.

1938491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938491 is an equidigital number, since it uses as much as digits as its factorization.

1938491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 1938491 is about 1392.2970229085. The cubic root of 1938491 is about 124.6870250273.

The spelling of 1938491 in words is "one million, nine hundred thirty-eight thousand, four hundred ninety-one".