1858139 has 2 divisors, whose sum is σ = 1858140. Its totient is φ = 1858138.

The previous prime is 1858133. The next prime is 1858163. The reversal of 1858139 is 9318581.

It is a weak prime.

It is an emirp because it is prime and its reverse (9318581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1858139 - 2¹⁶ = 1792603 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1858099 and 1858108.

It is not a weakly prime, because it can be changed into another prime (1858133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 929069 + 929070.

It is an arithmetic number, because the mean of its divisors is an integer number (929070).

2^1858139 is an apocalyptic number.

1858139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1858139 is an equidigital number, since it uses as much as digits as its factorization.

1858139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 1858139 is about 1363.1357232499. The cubic root of 1858139 is about 122.9398652884.

The spelling of 1858139 in words is "one million, eight hundred fifty-eight thousand, one hundred thirty-nine".