1906139 has 2 divisors, whose sum is σ = 1906140. Its totient is φ = 1906138.

The previous prime is 1906133. The next prime is 1906153. The reversal of 1906139 is 9316091.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1906139 - 2⁴ = 1906123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1906133) 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, 953069 + 953070.

It is an arithmetic number, because the mean of its divisors is an integer number (953070).

2^1906139 is an apocalyptic number.

1906139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906139 is an equidigital number, since it uses as much as digits as its factorization.

1906139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1906139 is about 1380.6299286920. The cubic root of 1906139 is about 123.9894848871.

The spelling of 1906139 in words is "one million, nine hundred six thousand, one hundred thirty-nine".