12177997 has 4 divisors (see below), whose sum is σ = 13114780. Its totient is φ = 11241216.

The previous prime is 12177983. The next prime is 12178007. The reversal of 12177997 is 79977121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3587236 + 8590761 = 1894^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 12177997 - 2¹¹ = 12175949 is a prime.

It is a super-2 number, since 2×12177997² = 296607221864018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12177497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468372 + ... + 468397.

It is an arithmetic number, because the mean of its divisors is an integer number (3278695).

Almost surely, 2^12177997 is an apocalyptic number.

It is an amenable number.

12177997 is a deficient number, since it is larger than the sum of its proper divisors (936783).

12177997 is an equidigital number, since it uses as much as digits as its factorization.

12177997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936782.

The product of its digits is 55566, while the sum is 43.

The square root of 12177997 is about 3489.6986975955. The cubic root of 12177997 is about 230.0692733995.

The spelling of 12177997 in words is "twelve million, one hundred seventy-seven thousand, nine hundred ninety-seven".