1211623 has 12 divisors (see below), whose sum is σ = 1431840. Its totient is φ = 1022112.

The previous prime is 1211621. The next prime is 1211629. The reversal of 1211623 is 3261121.

It is not a de Polignac number, because 1211623 - 2¹ = 1211621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211597 and 1211606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3715 + ... + 4027.

It is an arithmetic number, because the mean of its divisors is an integer number (119320).

2^1211623 is an apocalyptic number.

1211623 is a deficient number, since it is larger than the sum of its proper divisors (220217).

1211623 is an equidigital number, since it uses as much as digits as its factorization.

1211623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 399 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 1211623 is about 1100.7374800560. The cubic root of 1211623 is about 106.6078462592.

Adding to 1211623 its reverse (3261121), we get a palindrome (4472744).

The spelling of 1211623 in words is "one million, two hundred eleven thousand, six hundred twenty-three".