1906806889 has 9 divisors (see below), whose sum is σ = 2065382103. Its totient is φ = 1759605432.

The previous prime is 1906806871. The next prime is 1906806893. The reversal of 1906806889 is 9886086091.

The square root of 1906806889 is 43667.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 282072025 + 1624734864 = 16795^2 + 40308^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1906806889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1906806859) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 565992 + ... + 569350.

Almost surely, 2^1906806889 is an apocalyptic number.

1906806889 is the 43667-th square number.

1906806889 is the 21834-th centered octagonal number.

It is an amenable number.

1906806889 is a deficient number, since it is larger than the sum of its proper divisors (158575214).

1906806889 is an frugal number, since it uses more digits than its factorization.

1906806889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744 (or 3372 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The cubic root of 1906806889 is about 1240.0396468853.

The spelling of 1906806889 in words is "one billion, nine hundred six million, eight hundred six thousand, eight hundred eighty-nine".