1906806969 has 6 divisors (see below), whose sum is σ = 2754276746. Its totient is φ = 1271204640.

The previous prime is 1906806953. The next prime is 1906807009. The reversal of 1906806969 is 9696086091.

It can be written as a sum of positive squares in only one way, i.e., 1841439744 + 65367225 = 42912^2 + 8085^2 .

It is not a de Polignac number, because 1906806969 - 2⁴ = 1906806953 is a prime.

It is a super-2 number, since 2×1906806969² = 7271825634053933922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1906806469) 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, 105933712 + ... + 105933729.

Almost surely, 2^1906806969 is an apocalyptic number.

It is an amenable number.

1906806969 is a deficient number, since it is larger than the sum of its proper divisors (847469777).

1906806969 is a wasteful number, since it uses less digits than its factorization.

1906806969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211867447 (or 211867444 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 1906806969 is about 43667.0009160235. Note that the first 3 decimals coincide. The cubic root of 1906806969 is about 1240.0396642272.

The spelling of 1906806969 in words is "one billion, nine hundred six million, eight hundred six thousand, nine hundred sixty-nine".