1974391 has 2 divisors, whose sum is σ = 1974392. Its totient is φ = 1974390.

The previous prime is 1974383. The next prime is 1974403. The reversal of 1974391 is 1934791.

It is a weak prime.

It is an emirp because it is prime and its reverse (1934791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1974391 - 2³ = 1974383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974331) 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 as a sum of consecutive naturals, namely, 987195 + 987196.

It is an arithmetic number, because the mean of its divisors is an integer number (987196).

2^1974391 is an apocalyptic number.

1974391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974391 is an equidigital number, since it uses as much as digits as its factorization.

1974391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 1974391 is about 1405.1302430736. The cubic root of 1974391 is about 125.4520379894.

The spelling of 1974391 in words is "one million, nine hundred seventy-four thousand, three hundred ninety-one".