1242478 has 4 divisors (see below), whose sum is σ = 1863720. Its totient is φ = 621238.

The previous prime is 1242457. The next prime is 1242487. The reversal of 1242478 is 8742421.

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

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, 310618 + ... + 310621.

It is an arithmetic number, because the mean of its divisors is an integer number (465930).

2^1242478 is an apocalyptic number.

1242478 is a deficient number, since it is larger than the sum of its proper divisors (621242).

1242478 is an equidigital number, since it uses as much as digits as its factorization.

1242478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621241.

The product of its digits is 3584, while the sum is 28.

The square root of 1242478 is about 1114.6649720880. The cubic root of 1242478 is about 107.5052241918.

Adding to 1242478 its reverse (8742421), we get a palindrome (9984899).

The spelling of 1242478 in words is "one million, two hundred forty-two thousand, four hundred seventy-eight".