1906543 has 2 divisors, whose sum is σ = 1906544. Its totient is φ = 1906542.

The previous prime is 1906537. The next prime is 1906559. The reversal of 1906543 is 3456091.

It is a weak prime.

It is an emirp because it is prime and its reverse (3456091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1906543 - 2⁵ = 1906511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1906523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953271 + 953272.

It is an arithmetic number, because the mean of its divisors is an integer number (953272).

2^1906543 is an apocalyptic number.

1906543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906543 is an equidigital number, since it uses as much as digits as its factorization.

1906543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1906543 is about 1380.7762309658. The cubic root of 1906543 is about 123.9982439918.

The spelling of 1906543 in words is "one million, nine hundred six thousand, five hundred forty-three".