1218097847 has 8 divisors (see below), whose sum is σ = 1285178160. Its totient is φ = 1151314560.

The previous prime is 1218097801. The next prime is 1218097883. The reversal of 1218097847 is 7487908121.

It is a happy number.

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 1218097847 - 2⁸ = 1218097591 is a prime.

It is a super-4 number, since 4×1218097847⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218097147) 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, 65804 + ... + 82257.

It is an arithmetic number, because the mean of its divisors is an integer number (160647270).

Almost surely, 2^1218097847 is an apocalyptic number.

1218097847 is a deficient number, since it is larger than the sum of its proper divisors (67080313).

1218097847 is a wasteful number, since it uses less digits than its factorization.

1218097847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148513.

The product of its (nonzero) digits is 225792, while the sum is 47.

The square root of 1218097847 is about 34901.2585303166. The cubic root of 1218097847 is about 1067.9741114959.

The spelling of 1218097847 in words is "one billion, two hundred eighteen million, ninety-seven thousand, eight hundred forty-seven".