1213156824 has 64 divisors (see below), whose sum is σ = 3315600000. Its totient is φ = 366846720.

The previous prime is 1213156823. The next prime is 1213156843. The reversal of 1213156824 is 4286513121.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213156823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127132 + ... + 136340.

It is an arithmetic number, because the mean of its divisors is an integer number (51806250).

Almost surely, 2^1213156824 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213156824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1657800000).

1213156824 is an abundant number, since it is smaller than the sum of its proper divisors (2102443176).

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

1213156824 is a wasteful number, since it uses less digits than its factorization.

1213156824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728 (or 9724 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 1213156824 is about 34830.4008590197. The cubic root of 1213156824 is about 1066.5281314006.

Adding to 1213156824 its reverse (4286513121), we get a palindrome (5499669945).

The spelling of 1213156824 in words is "one billion, two hundred thirteen million, one hundred fifty-six thousand, eight hundred twenty-four".