1912689 has 9 divisors (see below), whose sum is σ = 2768779. Its totient is φ = 1272360.

The previous prime is 1912681. The next prime is 1912693. The reversal of 1912689 is 9862191.

The square root of 1912689 is 1383.

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., 613089 + 1299600 = 783^2 + 1140^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1912689 - 2³ = 1912681 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1912681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3919 + ... + 4379.

2^1912689 is an apocalyptic number.

1912689 is the 1383-rd square number.

1912689 is the 692-nd centered octagonal number.

It is an amenable number.

1912689 is a deficient number, since it is larger than the sum of its proper divisors (856090).

1912689 is an frugal number, since it uses more digits than its factorization.

1912689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 464 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The cubic root of 1912689 is about 124.1313427937.

Multiplying 1912689 by its sum of digits (36), we get a square (68856804 = 8298²).

It can be divided in two parts, 1912 and 689, that added together give a square (2601 = 51²).

The spelling of 1912689 in words is "one million, nine hundred twelve thousand, six hundred eighty-nine".