1216041400 has 96 divisors (see below), whose sum is σ = 3244212000. Its totient is φ = 415249920.

The previous prime is 1216041347. The next prime is 1216041413. The reversal of 1216041400 is 41406121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 374986 + ... + 378214.

It is an arithmetic number, because the mean of its divisors is an integer number (33793875).

Almost surely, 2^1216041400 is an apocalyptic number.

1216041400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216041400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1622106000).

1216041400 is an abundant number, since it is smaller than the sum of its proper divisors (2028170600).

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

1216041400 is a wasteful number, since it uses less digits than its factorization.

1216041400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521 (or 3512 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1216041400 is about 34871.7851564843. The cubic root of 1216041400 is about 1067.3727724904.

Adding to 1216041400 its reverse (41406121), we get a palindrome (1257447521).

The spelling of 1216041400 in words is "one billion, two hundred sixteen million, forty-one thousand, four hundred".