1218203696 has 40 divisors (see below), whose sum is σ = 2570185200. Its totient is φ = 557141760.

The previous prime is 1218203689. The next prime is 1218203713. The reversal of 1218203696 is 6963028121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60275 + ... + 77906.

It is an arithmetic number, because the mean of its divisors is an integer number (64254630).

Almost surely, 2^1218203696 is an apocalyptic number.

1218203696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218203696 is an abundant number, since it is smaller than the sum of its proper divisors (1351981504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218203696 is a wasteful number, since it uses less digits than its factorization.

1218203696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138237 (or 138231 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1218203696 is about 34902.7749040101. The cubic root of 1218203696 is about 1068.0050451678.

The spelling of 1218203696 in words is "one billion, two hundred eighteen million, two hundred three thousand, six hundred ninety-six".