1211540274 has 64 divisors (see below), whose sum is σ = 3082625280. Its totient is φ = 345513600.

The previous prime is 1211540251. The next prime is 1211540311. The reversal of 1211540274 is 4720451121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224512 + ... + 229844.

It is an arithmetic number, because the mean of its divisors is an integer number (48166020).

Almost surely, 2^1211540274 is an apocalyptic number.

1211540274 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211540274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1541312640).

1211540274 is an abundant number, since it is smaller than the sum of its proper divisors (1871085006).

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

1211540274 is a wasteful number, since it uses less digits than its factorization.

1211540274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5952 (or 5946 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1211540274 is about 34807.1871026660. The cubic root of 1211540274 is about 1066.0541991552.

Adding to 1211540274 its reverse (4720451121), we get a palindrome (5931991395).

The spelling of 1211540274 in words is "one billion, two hundred eleven million, five hundred forty thousand, two hundred seventy-four".