1231623 has 12 divisors (see below), whose sum is σ = 1789008. Its totient is φ = 816480.

The previous prime is 1231613. The next prime is 1231631. The reversal of 1231623 is 3261321.

1231623 is a `hidden beast` number, since 12 + 31 + 623 = 666.

It is not a de Polignac number, because 1231623 - 2¹⁰ = 1230599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231596 and 1231605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2286 + ... + 2772.

It is an arithmetic number, because the mean of its divisors is an integer number (149084).

2^1231623 is an apocalyptic number.

1231623 is a deficient number, since it is larger than the sum of its proper divisors (557385).

1231623 is a wasteful number, since it uses less digits than its factorization.

1231623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 771 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 1231623 is about 1109.7851143352. The cubic root of 1231623 is about 107.1912322505.

Adding to 1231623 its reverse (3261321), we get a palindrome (4492944).

The spelling of 1231623 in words is "one million, two hundred thirty-one thousand, six hundred twenty-three".