12401391 has 8 divisors (see below), whose sum is σ = 16561584. Its totient is φ = 8254400.

The previous prime is 12401369. The next prime is 12401399. The reversal of 12401391 is 19310421.

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 12401391 - 2⁹ = 12400879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12401399) 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, 846 + ... + 5051.

It is an arithmetic number, because the mean of its divisors is an integer number (2070198).

Almost surely, 2^12401391 is an apocalyptic number.

12401391 is a deficient number, since it is larger than the sum of its proper divisors (4160193).

12401391 is an equidigital number, since it uses as much as digits as its factorization.

12401391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 12401391 is about 3521.5608755210. The cubic root of 12401391 is about 231.4675599499.

The spelling of 12401391 in words is "twelve million, four hundred one thousand, three hundred ninety-one".