1218047 has 4 divisors (see below), whose sum is σ = 1220736. Its totient is φ = 1215360.

The previous prime is 1218043. The next prime is 1218089. The reversal of 1218047 is 7408121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7408121 = 7 ⋅1058303.

It is a cyclic number.

It is not a de Polignac number, because 1218047 - 2² = 1218043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218043) 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, 479 + ... + 1632.

It is an arithmetic number, because the mean of its divisors is an integer number (305184).

2^1218047 is an apocalyptic number.

1218047 is a deficient number, since it is larger than the sum of its proper divisors (2689).

1218047 is an equidigital number, since it uses as much as digits as its factorization.

1218047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1218047 is about 1103.6516660614. The cubic root of 1218047 is about 106.7959251158.

The spelling of 1218047 in words is "one million, two hundred eighteen thousand, forty-seven".