12038781 has 4 divisors (see below), whose sum is σ = 16051712. Its totient is φ = 8025852.

The previous prime is 12038779. The next prime is 12038797. The reversal of 12038781 is 18783021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12038781 - 2¹ = 12038779 is a prime.

It is a super-2 number, since 2×12038781² = 289864495931922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12038281) 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, 2006461 + ... + 2006466.

It is an arithmetic number, because the mean of its divisors is an integer number (4012928).

Almost surely, 2^12038781 is an apocalyptic number.

It is an amenable number.

12038781 is a deficient number, since it is larger than the sum of its proper divisors (4012931).

12038781 is an equidigital number, since it uses as much as digits as its factorization.

12038781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4012930.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 12038781 is about 3469.6946551534. The cubic root of 12038781 is about 229.1892119895.

The spelling of 12038781 in words is "twelve million, thirty-eight thousand, seven hundred eighty-one".