12243891 has 8 divisors (see below), whose sum is σ = 17809344. Its totient is φ = 7420520.

The previous prime is 12243883. The next prime is 12243899. The reversal of 12243891 is 19834221.

12243891 = T₂₄₈ + T₂₄₉ + ... + T₄₄₅.

It is an interprime number because it is at equal distance from previous prime (12243883) and next prime (12243899).

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 12243891 - 2³ = 12243883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12243899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185481 + ... + 185546.

It is an arithmetic number, because the mean of its divisors is an integer number (2226168).

Almost surely, 2^12243891 is an apocalyptic number.

12243891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12243891 is a deficient number, since it is larger than the sum of its proper divisors (5565453).

12243891 is a wasteful number, since it uses less digits than its factorization.

12243891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371041.

The product of its digits is 3456, while the sum is 30.

The square root of 12243891 is about 3499.1271768828. The cubic root of 12243891 is about 230.4834882920.

It can be divided in two parts, 1224 and 3891, that added together give a palindrome (5115).

The spelling of 12243891 in words is "twelve million, two hundred forty-three thousand, eight hundred ninety-one".