1211440023 has 8 divisors (see below), whose sum is σ = 1794726000. Its totient is φ = 807626664.

The previous prime is 1211440007. The next prime is 1211440049. The reversal of 1211440023 is 3200441121.

It is not a de Polignac number, because 1211440023 - 2⁴ = 1211440007 is a prime.

It is a super-3 number, since 3×1211440023³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211439978 and 1211440005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211440003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22434048 + ... + 22434101.

It is an arithmetic number, because the mean of its divisors is an integer number (224340750).

Almost surely, 2^1211440023 is an apocalyptic number.

1211440023 is a deficient number, since it is larger than the sum of its proper divisors (583285977).

1211440023 is an equidigital number, since it uses as much as digits as its factorization.

1211440023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44868158 (or 44868152 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1211440023 is about 34805.7469823591. The cubic root of 1211440023 is about 1066.0247941766.

Adding to 1211440023 its reverse (3200441121), we get a palindrome (4411881144).

The spelling of 1211440023 in words is "one billion, two hundred eleven million, four hundred forty thousand, twenty-three".