1954391 has 2 divisors, whose sum is σ = 1954392. Its totient is φ = 1954390.

The previous prime is 1954387. The next prime is 1954411. The reversal of 1954391 is 1934591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1954391 - 2² = 1954387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1954301) 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, 977195 + 977196.

It is an arithmetic number, because the mean of its divisors is an integer number (977196).

2^1954391 is an apocalyptic number.

1954391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954391 is an equidigital number, since it uses as much as digits as its factorization.

1954391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 32.

The square root of 1954391 is about 1397.9953504930. The cubic root of 1954391 is about 125.0270021666.

The spelling of 1954391 in words is "one million, nine hundred fifty-four thousand, three hundred ninety-one".