1861393 has 4 divisors (see below), whose sum is σ = 1878580. Its totient is φ = 1844208.

The previous prime is 1861351. The next prime is 1861397. The reversal of 1861393 is 3931681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1056784 + 804609 = 1028^2 + 897^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1861393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8430 + ... + 8647.

It is an arithmetic number, because the mean of its divisors is an integer number (469645).

2^1861393 is an apocalyptic number.

It is an amenable number.

1861393 is a deficient number, since it is larger than the sum of its proper divisors (17187).

1861393 is a wasteful number, since it uses less digits than its factorization.

1861393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17186.

The product of its digits is 3888, while the sum is 31.

The square root of 1861393 is about 1364.3287726937. The cubic root of 1861393 is about 123.0115881298.

The spelling of 1861393 in words is "one million, eight hundred sixty-one thousand, three hundred ninety-three".