1212985 has 16 divisors (see below), whose sum is σ = 1531152. Its totient is φ = 921600.

The previous prime is 1212973. The next prime is 1212989. The reversal of 1212985 is 5892121.

It can be written as a sum of positive squares in 8 ways, for example, as 480249 + 732736 = 693^2 + 856^2 .

It is not a de Polignac number, because 1212985 - 2⁷ = 1212857 is a prime.

It is a super-2 number, since 2×1212985² = 2942665220450, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12457 + ... + 12553.

It is an arithmetic number, because the mean of its divisors is an integer number (95697).

2^1212985 is an apocalyptic number.

It is an amenable number.

1212985 is a deficient number, since it is larger than the sum of its proper divisors (318167).

1212985 is an equidigital number, since it uses as much as digits as its factorization.

1212985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204.

The product of its digits is 1440, while the sum is 28.

The square root of 1212985 is about 1101.3559824144. The cubic root of 1212985 is about 106.6477776882.

It can be divided in two parts, 1212 and 985, that added together give a cube (2197 = 13³).

The spelling of 1212985 in words is "one million, two hundred twelve thousand, nine hundred eighty-five".