1211538432 has 176 divisors, whose sum is σ = 3631541760. Its totient is φ = 356302848.

The previous prime is 1211538431. The next prime is 1211538437. The reversal of 1211538432 is 2348351121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211538432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211538431) 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, 917869 + ... + 919187.

It is an arithmetic number, because the mean of its divisors is an integer number (20633760).

Almost surely, 2^1211538432 is an apocalyptic number.

1211538432 is a gapful number since it is divisible by the number (12) 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 1211538432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1815770880).

1211538432 is an abundant number, since it is smaller than the sum of its proper divisors (2420003328).

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

1211538432 is a wasteful number, since it uses less digits than its factorization.

1211538432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378 (or 1360 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 1211538432 is about 34807.1606426034. The cubic root of 1211538432 is about 1066.0536588862.

Adding to 1211538432 its reverse (2348351121), we get a palindrome (3559889553).

The spelling of 1211538432 in words is "one billion, two hundred eleven million, five hundred thirty-eight thousand, four hundred thirty-two".