1231863 has 4 divisors (see below), whose sum is σ = 1642488. Its totient is φ = 821240.

The previous prime is 1231859. The next prime is 1231873. The reversal of 1231863 is 3681321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231863 - 2² = 1231859 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231843) 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, 205308 + ... + 205313.

It is an arithmetic number, because the mean of its divisors is an integer number (410622).

2^1231863 is an apocalyptic number.

1231863 is a deficient number, since it is larger than the sum of its proper divisors (410625).

1231863 is an equidigital number, since it uses as much as digits as its factorization.

1231863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410624.

The product of its digits is 864, while the sum is 24.

The square root of 1231863 is about 1109.8932381090. The cubic root of 1231863 is about 107.1981943986.

The spelling of 1231863 in words is "one million, two hundred thirty-one thousand, eight hundred sixty-three".