1211634140 has 24 divisors (see below), whose sum is σ = 2545337760. Its totient is φ = 484481088.

The previous prime is 1211634059. The next prime is 1211634143. The reversal of 1211634140 is 414361121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211634143) 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, 57254 + ... + 75506.

It is an arithmetic number, because the mean of its divisors is an integer number (106055740).

Almost surely, 2^1211634140 is an apocalyptic number.

1211634140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211634140 is an abundant number, since it is smaller than the sum of its proper divisors (1333703620).

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

1211634140 is a wasteful number, since it uses less digits than its factorization.

1211634140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21581 (or 21579 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1211634140 is about 34808.5354475020. The cubic root of 1211634140 is about 1066.0817298562.

Adding to 1211634140 its reverse (414361121), we get a palindrome (1625995261).

The spelling of 1211634140 in words is "one billion, two hundred eleven million, six hundred thirty-four thousand, one hundred forty".