1242985 has 4 divisors (see below), whose sum is σ = 1491588. Its totient is φ = 994384.

The previous prime is 1242979. The next prime is 1242991. The reversal of 1242985 is 5892421.

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

It is an interprime number because it is at equal distance from previous prime (1242979) and next prime (1242991).

It can be written as a sum of positive squares in 2 ways, for example, as 138384 + 1104601 = 372^2 + 1051^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242985 - 2³ = 1242977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 124294 + ... + 124303.

It is an arithmetic number, because the mean of its divisors is an integer number (372897).

2^1242985 is an apocalyptic number.

It is an amenable number.

1242985 is a deficient number, since it is larger than the sum of its proper divisors (248603).

1242985 is an equidigital number, since it uses as much as digits as its factorization.

1242985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248602.

The product of its digits is 5760, while the sum is 31.

The square root of 1242985 is about 1114.8923714870. The cubic root of 1242985 is about 107.5198449031.

The spelling of 1242985 in words is "one million, two hundred forty-two thousand, nine hundred eighty-five".