1242427 has 4 divisors (see below), whose sum is σ = 1257480. Its totient is φ = 1227376.

The previous prime is 1242421. The next prime is 1242457. The reversal of 1242427 is 7242421.

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: 7242421 = 521 ⋅13901.

It is a cyclic number.

It is not a de Polignac number, because 1242427 - 2³ = 1242419 is a prime.

It is a Duffinian number.

1242427 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1242398 and 1242407.

It is not an unprimeable number, because it can be changed into a prime (1242421) by changing a digit.

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, 7402 + ... + 7567.

It is an arithmetic number, because the mean of its divisors is an integer number (314370).

2^1242427 is an apocalyptic number.

1242427 is a deficient number, since it is larger than the sum of its proper divisors (15053).

1242427 is an equidigital number, since it uses as much as digits as its factorization.

1242427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15052.

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

The square root of 1242427 is about 1114.6420950242. The cubic root of 1242427 is about 107.5037532492.

Adding to 1242427 its reverse (7242421), we get a palindrome (8484848).

The spelling of 1242427 in words is "one million, two hundred forty-two thousand, four hundred twenty-seven".