1242742 has 4 divisors (see below), whose sum is σ = 1864116. Its totient is φ = 621370.

The previous prime is 1242739. The next prime is 1242757. The reversal of 1242742 is 2472421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2472421 = 7 ⋅353203.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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 as a sum of consecutive naturals, namely, 310684 + ... + 310687.

It is an arithmetic number, because the mean of its divisors is an integer number (466029).

2^1242742 is an apocalyptic number.

1242742 is a deficient number, since it is larger than the sum of its proper divisors (621374).

1242742 is an equidigital number, since it uses as much as digits as its factorization.

1242742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621373.

The product of its digits is 896, while the sum is 22.

The square root of 1242742 is about 1114.7833870309. The cubic root of 1242742 is about 107.5128378395.

The spelling of 1242742 in words is "one million, two hundred forty-two thousand, seven hundred forty-two".