1863641 has 4 divisors (see below), whose sum is σ = 2007012. Its totient is φ = 1720272.

The previous prime is 1863637. The next prime is 1863647. The reversal of 1863641 is 1463681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1463681 = 1103 ⋅1327.

It can be written as a sum of positive squares in 2 ways, for example, as 1008016 + 855625 = 1004^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1863641 - 2² = 1863637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1863647) 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, 71666 + ... + 71691.

It is an arithmetic number, because the mean of its divisors is an integer number (501753).

2^1863641 is an apocalyptic number.

It is an amenable number.

1863641 is a deficient number, since it is larger than the sum of its proper divisors (143371).

1863641 is a wasteful number, since it uses less digits than its factorization.

1863641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143370.

The product of its digits is 3456, while the sum is 29.

The square root of 1863641 is about 1365.1523724479. The cubic root of 1863641 is about 123.0610884777.

The spelling of 1863641 in words is "one million, eight hundred sixty-three thousand, six hundred forty-one".