1906857 has 6 divisors (see below), whose sum is σ = 2754362. Its totient is φ = 1271232.

The previous prime is 1906843. The next prime is 1906867. The reversal of 1906857 is 7586091.

It can be written as a sum of positive squares in only one way, i.e., 1838736 + 68121 = 1356^2 + 261^2 .

It is not a de Polignac number, because 1906857 - 2¹¹ = 1904809 is a prime.

It is a super-2 number, since 2×1906857² = 7272207236898, which contains 22 as substring.

It is a Duffinian number.

1906857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1906867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105928 + ... + 105945.

2^1906857 is an apocalyptic number.

It is an amenable number.

1906857 is a deficient number, since it is larger than the sum of its proper divisors (847505).

1906857 is a wasteful number, since it uses less digits than its factorization.

1906857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211879 (or 211876 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 1906857 is about 1380.8899304434. The cubic root of 1906857 is about 124.0050509562.

The spelling of 1906857 in words is "one million, nine hundred six thousand, eight hundred fifty-seven".