1211944464 has 80 divisors (see below), whose sum is σ = 3492901440. Its totient is φ = 402336000.

The previous prime is 1211944403. The next prime is 1211944471. The reversal of 1211944464 is 4644491121.

It is a happy number.

1211944464 is a `hidden beast` number, since 1 + 2 + 1 + 194 + 4 + 464 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102844 + ... + 114020.

It is an arithmetic number, because the mean of its divisors is an integer number (43661268).

Almost surely, 2^1211944464 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 1211944464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746450720).

1211944464 is an abundant number, since it is smaller than the sum of its proper divisors (2280956976).

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

1211944464 is a wasteful number, since it uses less digits than its factorization.

1211944464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11445 (or 11433 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1211944464 is about 34812.9927469616. The cubic root of 1211944464 is about 1066.1727371154.

The spelling of 1211944464 in words is "one billion, two hundred eleven million, nine hundred forty-four thousand, four hundred sixty-four".