1216300040 has 64 divisors (see below), whose sum is σ = 2769681600. Its totient is φ = 480690432.

The previous prime is 1216300039. The next prime is 1216300061. The reversal of 1216300040 is 400036121.

It is a junction number, because it is equal to n+sod(n) for n = 1216299991 and 1216300018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1573094 + ... + 1573866.

It is an arithmetic number, because the mean of its divisors is an integer number (43276275).

Almost surely, 2^1216300040 is an apocalyptic number.

1216300040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216300040 is an abundant number, since it is smaller than the sum of its proper divisors (1553381560).

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

1216300040 is a wasteful number, since it uses less digits than its factorization.

1216300040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1202 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1216300040 is about 34875.4934015277. The cubic root of 1216300040 is about 1067.4484403429.

Adding to 1216300040 its reverse (400036121), we get a palindrome (1616336161).

The spelling of 1216300040 in words is "one billion, two hundred sixteen million, three hundred thousand, forty".