1212865 has 16 divisors (see below), whose sum is σ = 1624320. Its totient is φ = 864000.

The previous prime is 1212857. The next prime is 1212877. The reversal of 1212865 is 5682121.

It is not a de Polignac number, because 1212865 - 2³ = 1212857 is a prime.

1212865 is a lucky 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 15 ways as a sum of consecutive naturals, for example, 1240 + ... + 1990.

It is an arithmetic number, because the mean of its divisors is an integer number (101520).

2^1212865 is an apocalyptic number.

It is an amenable number.

1212865 is a deficient number, since it is larger than the sum of its proper divisors (411455).

1212865 is a wasteful number, since it uses less digits than its factorization.

1212865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its digits is 960, while the sum is 25.

The square root of 1212865 is about 1101.3015027684. The cubic root of 1212865 is about 106.6442607018.

Adding to 1212865 its reverse (5682121), we get a palindrome (6894986).

The spelling of 1212865 in words is "one million, two hundred twelve thousand, eight hundred sixty-five".