1856906 has 4 divisors (see below), whose sum is σ = 2785362. Its totient is φ = 928452.

The previous prime is 1856903. The next prime is 1856909. The reversal of 1856906 is 6096581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6096581 = 1621 ⋅3761.

It is an interprime number because it is at equal distance from previous prime (1856903) and next prime (1856909).

It can be written as a sum of positive squares in only one way, i.e., 1301881 + 555025 = 1141^2 + 745^2 .

It is not an unprimeable number, because it can be changed into a prime (1856903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 464225 + ... + 464228.

2^1856906 is an apocalyptic number.

1856906 is a deficient number, since it is larger than the sum of its proper divisors (928456).

1856906 is an equidigital number, since it uses as much as digits as its factorization.

1856906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928455.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1856906 is about 1362.6833821545. The cubic root of 1856906 is about 122.9126663194.

The spelling of 1856906 in words is "one million, eight hundred fifty-six thousand, nine hundred six".