1211805952 has 72 divisors (see below), whose sum is σ = 2805970496. Its totient is φ = 511543296.

The previous prime is 1211805929. The next prime is 1211805953. The reversal of 1211805952 is 2595081121.

It is not an unprimeable number, because it can be changed into a prime (1211805953) 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, 115018 + ... + 125110.

Almost surely, 2^1211805952 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 1211805952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1402985248).

1211805952 is an abundant number, since it is smaller than the sum of its proper divisors (1594164544).

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

1211805952 is an equidigital number, since it uses as much as digits as its factorization.

1211805952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10183 (or 10169 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 1211805952 is about 34811.0033179166. The cubic root of 1211805952 is about 1066.1321182727.

The spelling of 1211805952 in words is "one billion, two hundred eleven million, eight hundred five thousand, nine hundred fifty-two".