1863681 has 4 divisors (see below), whose sum is σ = 2484912. Its totient is φ = 1242452.

The previous prime is 1863677. The next prime is 1863683.

1863681 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1863681 - 2² = 1863677 is a prime.

It is a super-2 number, since 2×1863681² = 6946613739522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1863683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310611 + ... + 310616.

It is an arithmetic number, because the mean of its divisors is an integer number (621228).

It is a Proth number, since it is equal to 455 ⋅ 2¹² + 1 and 455 < 2¹².

2^1863681 is an apocalyptic number.

It is an amenable number.

1863681 is a deficient number, since it is larger than the sum of its proper divisors (621231).

1863681 is an equidigital number, since it uses as much as digits as its factorization.

1863681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621230.

The product of its digits is 6912, while the sum is 33.

The square root of 1863681 is about 1365.1670227485. The cubic root of 1863681 is about 123.0619689063.

The spelling of 1863681 in words is "one million, eight hundred sixty-three thousand, six hundred eighty-one".