1242518 has 4 divisors (see below), whose sum is σ = 1863780. Its totient is φ = 621258.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242518 is 8152421.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1242493 and 1242502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310628 + ... + 310631.

It is an arithmetic number, because the mean of its divisors is an integer number (465945).

2^1242518 is an apocalyptic number.

1242518 is a deficient number, since it is larger than the sum of its proper divisors (621262).

1242518 is an equidigital number, since it uses as much as digits as its factorization.

1242518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621261.

The product of its digits is 640, while the sum is 23.

The square root of 1242518 is about 1114.6829145546. The cubic root of 1242518 is about 107.5063778441.

Adding to 1242518 its reverse (8152421), we get a palindrome (9394939).

Subtracting 1242518 from its reverse (8152421), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1242518 in words is "one million, two hundred forty-two thousand, five hundred eighteen".