1856840137 has 2 divisors, whose sum is σ = 1856840138. Its totient is φ = 1856840136.

The previous prime is 1856840131. The next prime is 1856840149. The reversal of 1856840137 is 7310486581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1821923856 + 34916281 = 42684^2 + 5909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1856840137 - 2³ = 1856840129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1856840093 and 1856840102.

It is not a weakly prime, because it can be changed into another prime (1856840131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 928420068 + 928420069.

It is an arithmetic number, because the mean of its divisors is an integer number (928420069).

Almost surely, 2^1856840137 is an apocalyptic number.

It is an amenable number.

1856840137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1856840137 is an equidigital number, since it uses as much as digits as its factorization.

1856840137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 1856840137 is about 43091.0679491702. The cubic root of 1856840137 is about 1229.1121309694.

The spelling of 1856840137 in words is "one billion, eight hundred fifty-six million, eight hundred forty thousand, one hundred thirty-seven".