12045391 has 8 divisors (see below), whose sum is σ = 12481664. Its totient is φ = 11612160.

The previous prime is 12045347. The next prime is 12045409. The reversal of 12045391 is 19354021.

12045391 = T₈₆₆ + T₈₆₇ + ... + T₈₉₆.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 12-Lehmer number, since φ(12045391) divides (12045391-1)¹².

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12045391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12042391) 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, 9871 + ... + 11023.

It is an arithmetic number, because the mean of its divisors is an integer number (1560208).

Almost surely, 2^12045391 is an apocalyptic number.

12045391 is a deficient number, since it is larger than the sum of its proper divisors (436273).

12045391 is a wasteful number, since it uses less digits than its factorization.

12045391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12045391 is about 3470.6470578265. The cubic root of 12045391 is about 229.2311504413.

The spelling of 12045391 in words is "twelve million, forty-five thousand, three hundred ninety-one".