12390391 has 8 divisors (see below), whose sum is σ = 13396544. Its totient is φ = 11391840.

The previous prime is 12390379. The next prime is 12390401. The reversal of 12390391 is 19309321.

12390391 = 64² + 65² + ... + 334².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12390391 - 2⁹ = 12389879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12390311) 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 7 ways as a sum of consecutive naturals, for example, 1765 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (1674568).

Almost surely, 2^12390391 is an apocalyptic number.

12390391 is a deficient number, since it is larger than the sum of its proper divisors (1006153).

12390391 is a wasteful number, since it uses less digits than its factorization.

12390391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 12390391 is about 3519.9987215907. The cubic root of 12390391 is about 231.3991026739.

The spelling of 12390391 in words is "twelve million, three hundred ninety thousand, three hundred ninety-one".