12249891 has 6 divisors (see below), whose sum is σ = 17694300. Its totient is φ = 8166588.

The previous prime is 12249847. The next prime is 12249907. The reversal of 12249891 is 19894221.

It is not a de Polignac number, because 12249891 - 2⁶ = 12249827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12249821) 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, 680541 + ... + 680558.

It is an arithmetic number, because the mean of its divisors is an integer number (2949050).

Almost surely, 2^12249891 is an apocalyptic number.

12249891 is a deficient number, since it is larger than the sum of its proper divisors (5444409).

12249891 is a wasteful number, since it uses less digits than its factorization.

12249891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361105 (or 1361102 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 12249891 is about 3499.9844285368. The cubic root of 12249891 is about 230.5211308763.

The spelling of 12249891 in words is "twelve million, two hundred forty-nine thousand, eight hundred ninety-one".