1211303340 has 144 divisors (see below), whose sum is σ = 4031995968. Its totient is φ = 292511232.

The previous prime is 1211303339. The next prime is 1211303341. The reversal of 1211303340 is 433031121.

1211303340 is a `hidden beast` number, since 1 + 21 + 1 + 303 + 340 = 666.

It is an interprime number because it is at equal distance from previous prime (1211303339) and next prime (1211303341).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1211303341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119137 + ... + 128903.

It is an arithmetic number, because the mean of its divisors is an integer number (27999972).

Almost surely, 2^1211303340 is an apocalyptic number.

1211303340 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 1211303340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2015997984).

1211303340 is an abundant number, since it is smaller than the sum of its proper divisors (2820692628).

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

1211303340 is a wasteful number, since it uses less digits than its factorization.

1211303340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9848 (or 9843 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1211303340 is about 34803.7834150254. The cubic root of 1211303340 is about 1065.9847005843.

Adding to 1211303340 its reverse (433031121), we get a palindrome (1644334461).

The spelling of 1211303340 in words is "one billion, two hundred eleven million, three hundred three thousand, three hundred forty".