1938791 has 2 divisors, whose sum is σ = 1938792. Its totient is φ = 1938790.

The previous prime is 1938787. The next prime is 1938803. The reversal of 1938791 is 1978391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1938791 - 2² = 1938787 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969395 + 969396.

It is an arithmetic number, because the mean of its divisors is an integer number (969396).

2^1938791 is an apocalyptic number.

1938791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938791 is an equidigital number, since it uses as much as digits as its factorization.

1938791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 38.

The square root of 1938791 is about 1392.4047543728. The cubic root of 1938791 is about 124.6934568650.

The spelling of 1938791 in words is "one million, nine hundred thirty-eight thousand, seven hundred ninety-one".