1806913 has 8 divisors (see below), whose sum is σ = 1928232. Its totient is φ = 1687296.

The previous prime is 1806901. The next prime is 1806941. The reversal of 1806913 is 3196081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 908209 + 898704 = 953^2 + 948^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1806913 - 2¹³ = 1798721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1806943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2331 + ... + 3007.

It is an arithmetic number, because the mean of its divisors is an integer number (241029).

2^1806913 is an apocalyptic number.

It is an amenable number.

1806913 is a deficient number, since it is larger than the sum of its proper divisors (121319).

1806913 is a wasteful number, since it uses less digits than its factorization.

1806913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1806913 is about 1344.2146405987. The cubic root of 1806913 is about 121.7995678742.

The spelling of 1806913 in words is "one million, eight hundred six thousand, nine hundred thirteen".