1212533740 has 72 divisors (see below), whose sum is σ = 2838671136. Its totient is φ = 434649600.

The previous prime is 1212533717. The next prime is 1212533741. The reversal of 1212533740 is 473352121.

It is a super-5 number, since 5×1212533740⁵ (a number of 47 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212533699 and 1212533708.

It is not an unprimeable number, because it can be changed into a prime (1212533741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168292 + ... + 175348.

It is an arithmetic number, because the mean of its divisors is an integer number (39425988).

Almost surely, 2^1212533740 is an apocalyptic number.

1212533740 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 1212533740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1419335568).

1212533740 is an abundant number, since it is smaller than the sum of its proper divisors (1626137396).

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

1212533740 is a wasteful number, since it uses less digits than its factorization.

1212533740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7159 (or 7146 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 1212533740 is about 34821.4551677554. The cubic root of 1212533740 is about 1066.3455085653.

Adding to 1212533740 its reverse (473352121), we get a palindrome (1685885861).

The spelling of 1212533740 in words is "one billion, two hundred twelve million, five hundred thirty-three thousand, seven hundred forty".