1211140240 has 160 divisors (see below), whose sum is σ = 3045233664. Its totient is φ = 447068160.

The previous prime is 1211140159. The next prime is 1211140261. The reversal of 1211140240 is 420411121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6147822 + ... + 6148018.

Almost surely, 2^1211140240 is an apocalyptic number.

1211140240 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 1211140240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1522616832).

1211140240 is an abundant number, since it is smaller than the sum of its proper divisors (1834093424).

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

1211140240 is a wasteful number, since it uses less digits than its factorization.

1211140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1211140240 is about 34801.4402000837. The cubic root of 1211140240 is about 1065.9368540752.

Adding to 1211140240 its reverse (420411121), we get a palindrome (1631551361).

The spelling of 1211140240 in words is "one billion, two hundred eleven million, one hundred forty thousand, two hundred forty".