1216003632 has 40 divisors (see below), whose sum is σ = 3184383984. Its totient is φ = 399780864.

The previous prime is 1216003609. The next prime is 1216003639. The reversal of 1216003632 is 2363006121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1216003639) 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, 170013 + ... + 177020.

Almost surely, 2^1216003632 is an apocalyptic number.

1216003632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216003632 is an abundant number, since it is smaller than the sum of its proper divisors (1968380352).

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

1216003632 is a wasteful number, since it uses less digits than its factorization.

1216003632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347117 (or 347111 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 1216003632 is about 34871.2436256581. The cubic root of 1216003632 is about 1067.3617221670.

Adding to 1216003632 its reverse (2363006121), we get a palindrome (3579009753).

The spelling of 1216003632 in words is "one billion, two hundred sixteen million, three thousand, six hundred thirty-two".