1218397523 has 8 divisors (see below), whose sum is σ = 1399524192. Its totient is φ = 1039038336.

The previous prime is 1218397511. The next prime is 1218397573. The reversal of 1218397523 is 3257938121.

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

It is not a de Polignac number, because 1218397523 - 2⁶ = 1218397459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218397573) 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, 440390 + ... + 443147.

It is an arithmetic number, because the mean of its divisors is an integer number (174940524).

Almost surely, 2^1218397523 is an apocalyptic number.

1218397523 is a deficient number, since it is larger than the sum of its proper divisors (181126669).

1218397523 is an equidigital number, since it uses as much as digits as its factorization.

1218397523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883741.

The product of its digits is 90720, while the sum is 41.

The square root of 1218397523 is about 34905.5514639147. The cubic root of 1218397523 is about 1068.0616851853.

The spelling of 1218397523 in words is "one billion, two hundred eighteen million, three hundred ninety-seven thousand, five hundred twenty-three".