1242647 has 8 divisors (see below), whose sum is σ = 1430016. Its totient is φ = 1057752.

The previous prime is 1242643. The next prime is 1242739. The reversal of 1242647 is 7462421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242647 - 2² = 1242643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (178752).

2^1242647 is an apocalyptic number.

1242647 is a deficient number, since it is larger than the sum of its proper divisors (187369).

1242647 is a wasteful number, since it uses less digits than its factorization.

1242647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its digits is 2688, while the sum is 26.

The square root of 1242647 is about 1114.7407770419. The cubic root of 1242647 is about 107.5100982041.

The spelling of 1242647 in words is "one million, two hundred forty-two thousand, six hundred forty-seven".