12645919 has 16 divisors (see below), whose sum is σ = 14966784. Its totient is φ = 10533600.

The previous prime is 12645911. The next prime is 12645931. The reversal of 12645919 is 91954621.

It is not a de Polignac number, because 12645919 - 2³ = 12645911 is a prime.

It is a super-2 number, since 2×12645919² = 319838534709122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12645911) 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 15 ways as a sum of consecutive naturals, for example, 27082 + ... + 27544.

It is an arithmetic number, because the mean of its divisors is an integer number (935424).

Almost surely, 2^12645919 is an apocalyptic number.

12645919 is a deficient number, since it is larger than the sum of its proper divisors (2320865).

12645919 is a wasteful number, since it uses less digits than its factorization.

12645919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678.

The product of its digits is 19440, while the sum is 37.

The square root of 12645919 is about 3556.1100939088. The cubic root of 12645919 is about 232.9790116604.

The spelling of 12645919 in words is "twelve million, six hundred forty-five thousand, nine hundred nineteen".