12005919 has 6 divisors (see below), whose sum is σ = 17341896. Its totient is φ = 8003940.

The previous prime is 12005909. The next prime is 12005923. The reversal of 12005919 is 91950021.

It is a happy number.

It is not a de Polignac number, because 12005919 - 2⁹ = 12005407 is a prime.

It is a super-2 number, since 2×12005919² = 288284182069122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12005892 and 12005901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666987 + ... + 667004.

It is an arithmetic number, because the mean of its divisors is an integer number (2890316).

Almost surely, 2^12005919 is an apocalyptic number.

12005919 is a deficient number, since it is larger than the sum of its proper divisors (5335977).

12005919 is a wasteful number, since it uses less digits than its factorization.

12005919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333997 (or 1333994 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 12005919 is about 3464.9558438745. The cubic root of 12005919 is about 228.9804843434.

The spelling of 12005919 in words is "twelve million, five thousand, nine hundred nineteen".