1218878522 has 16 divisors (see below), whose sum is σ = 1919289600. Its totient is φ = 579781920.

The previous prime is 1218878509. The next prime is 1218878527. The reversal of 1218878522 is 2258788121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1218878527) 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, 162947 + ... + 170262.

It is an arithmetic number, because the mean of its divisors is an integer number (119955600).

Almost surely, 2^1218878522 is an apocalyptic number.

1218878522 is a deficient number, since it is larger than the sum of its proper divisors (700411078).

1218878522 is a wasteful number, since it uses less digits than its factorization.

1218878522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333301.

The product of its digits is 143360, while the sum is 44.

The square root of 1218878522 is about 34912.4407912137. The cubic root of 1218878522 is about 1068.2022164988.

The spelling of 1218878522 in words is "one billion, two hundred eighteen million, eight hundred seventy-eight thousand, five hundred twenty-two".