1211418240 has 128 divisors (see below), whose sum is σ = 3900251520. Its totient is φ = 319795200.

The previous prime is 1211418233. The next prime is 1211418251. The reversal of 1211418240 is 428141121.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-3 number, since 3×1211418240³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1211418240.

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, 190797 + ... + 197043.

It is an arithmetic number, because the mean of its divisors is an integer number (30470715).

Almost surely, 2^1211418240 is an apocalyptic number.

1211418240 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 1211418240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1950125760).

1211418240 is an abundant number, since it is smaller than the sum of its proper divisors (2688833280).

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

1211418240 is a wasteful number, since it uses less digits than its factorization.

1211418240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6370 (or 6358 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 1211418240 is about 34805.4340584915. The cubic root of 1211418240 is about 1066.0184047126.

Adding to 1211418240 its reverse (428141121), we get a palindrome (1639559361).

The spelling of 1211418240 in words is "one billion, two hundred eleven million, four hundred eighteen thousand, two hundred forty".