12400191 has 12 divisors (see below), whose sum is σ = 18965232. Its totient is φ = 7780416.

The previous prime is 12400183. The next prime is 12400231. The reversal of 12400191 is 19100421.

It is not a de Polignac number, because 12400191 - 2³ = 12400183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40371 + ... + 40676.

It is an arithmetic number, because the mean of its divisors is an integer number (1580436).

Almost surely, 2^12400191 is an apocalyptic number.

12400191 is a deficient number, since it is larger than the sum of its proper divisors (6565041).

12400191 is a wasteful number, since it uses less digits than its factorization.

12400191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81070 (or 81067 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 12400191 is about 3521.3904924050. The cubic root of 12400191 is about 231.4600938511.

The spelling of 12400191 in words is "twelve million, four hundred thousand, one hundred ninety-one".