12091398 has 16 divisors (see below), whose sum is σ = 26381376. Its totient is φ = 3664040.

The previous prime is 12091381. The next prime is 12091411. The reversal of 12091398 is 89319021.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91536 + ... + 91667.

It is an arithmetic number, because the mean of its divisors is an integer number (1648836).

Almost surely, 2^12091398 is an apocalyptic number.

12091398 is an abundant number, since it is smaller than the sum of its proper divisors (14289978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12091398 is a wasteful number, since it uses less digits than its factorization.

12091398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183219.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 12091398 is about 3477.2687557910. The cubic root of 12091398 is about 229.5226267675.

The spelling of 12091398 in words is "twelve million, ninety-one thousand, three hundred ninety-eight".