12023781 has 16 divisors (see below), whose sum is σ = 19987968. Its totient is φ = 6246000.

The previous prime is 12023773. The next prime is 12023797. The reversal of 12023781 is 18732021.

It is not a de Polignac number, because 12023781 - 2³ = 12023773 is a prime.

It is a super-2 number, since 2×12023781² = 289142619071922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12023281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25795 + ... + 26256.

It is an arithmetic number, because the mean of its divisors is an integer number (1249248).

Almost surely, 2^12023781 is an apocalyptic number.

12023781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12023781 is a deficient number, since it is larger than the sum of its proper divisors (7964187).

12023781 is a wasteful number, since it uses less digits than its factorization.

12023781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52072.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12023781 is about 3467.5324079235. The cubic root of 12023781 is about 229.0939845467.

The spelling of 12023781 in words is "twelve million, twenty-three thousand, seven hundred eighty-one".