12120815 has 8 divisors (see below), whose sum is σ = 16622880. Its totient is φ = 8311392.

The previous prime is 12120781. The next prime is 12120833. The reversal of 12120815 is 51802121.

It is a happy number.

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 12120815 - 2⁶ = 12120751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173120 + ... + 173189.

It is an arithmetic number, because the mean of its divisors is an integer number (2077860).

Almost surely, 2^12120815 is an apocalyptic number.

12120815 is a deficient number, since it is larger than the sum of its proper divisors (4502065).

12120815 is an equidigital number, since it uses as much as digits as its factorization.

12120815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346321.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 12120815 is about 3481.4960864548. The cubic root of 12120815 is about 229.7086101967.

Adding to 12120815 its reverse (51802121), we get a palindrome (63922936).

The spelling of 12120815 in words is "twelve million, one hundred twenty thousand, eight hundred fifteen".