1203861 has 4 divisors (see below), whose sum is σ = 1605152. Its totient is φ = 802572.

The previous prime is 1203841. The next prime is 1203863. The reversal of 1203861 is 1683021.

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 not a de Polignac number, because 1203861 - 2⁷ = 1203733 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200641 + ... + 200646.

It is an arithmetic number, because the mean of its divisors is an integer number (401288).

2^1203861 is an apocalyptic number.

It is an amenable number.

1203861 is a deficient number, since it is larger than the sum of its proper divisors (401291).

1203861 is an equidigital number, since it uses as much as digits as its factorization.

1203861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401290.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1203861 is about 1097.2059970671. The cubic root of 1203861 is about 106.3797050349.

Adding to 1203861 its reverse (1683021), we get a palindrome (2886882).

The spelling of 1203861 in words is "one million, two hundred three thousand, eight hundred sixty-one".