1212145 has 8 divisors (see below), whose sum is σ = 1586880. Its totient is φ = 881520.

The previous prime is 1212121. The next prime is 1212149. The reversal of 1212145 is 5412121.

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

It is not a de Polignac number, because 1212145 - 2⁷ = 1212017 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (1212149) 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 7 ways as a sum of consecutive naturals, for example, 10965 + ... + 11074.

It is an arithmetic number, because the mean of its divisors is an integer number (198360).

2^1212145 is an apocalyptic number.

It is an amenable number.

1212145 is a deficient number, since it is larger than the sum of its proper divisors (374735).

1212145 is a wasteful number, since it uses less digits than its factorization.

1212145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22055.

The product of its digits is 80, while the sum is 16.

The square root of 1212145 is about 1100.9745682803. The cubic root of 1212145 is about 106.6231539101.

Adding to 1212145 its reverse (5412121), we get a palindrome (6624266).

The spelling of 1212145 in words is "one million, two hundred twelve thousand, one hundred forty-five".