1242147 has 4 divisors (see below), whose sum is σ = 1656200. Its totient is φ = 828096.

The previous prime is 1242121. The next prime is 1242151. The reversal of 1242147 is 7412421.

It is a happy number.

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

It is not a de Polignac number, because 1242147 - 2¹² = 1238051 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207022 + ... + 207027.

It is an arithmetic number, because the mean of its divisors is an integer number (414050).

2^1242147 is an apocalyptic number.

1242147 is a deficient number, since it is larger than the sum of its proper divisors (414053).

1242147 is an equidigital number, since it uses as much as digits as its factorization.

1242147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414052.

The product of its digits is 448, while the sum is 21.

The square root of 1242147 is about 1114.5164870920. The cubic root of 1242147 is about 107.4956767686.

Adding to 1242147 its reverse (7412421), we get a palindrome (8654568).

The spelling of 1242147 in words is "one million, two hundred forty-two thousand, one hundred forty-seven".