1211562240 has 432 divisors, whose sum is σ = 4630493952. Its totient is φ = 269058048.

The previous prime is 1211562229. The next prime is 1211562257. The reversal of 1211562240 is 422651121.

It is a super-2 number, since 2×1211562240² = 2935766122787635200, which contains 22 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 1211562240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8843452 + ... + 8843588.

It is an arithmetic number, because the mean of its divisors is an integer number (10718736).

Almost surely, 2^1211562240 is an apocalyptic number.

1211562240 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 1211562240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2315246976).

1211562240 is an abundant number, since it is smaller than the sum of its proper divisors (3418931712).

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

1211562240 is a wasteful number, since it uses less digits than its factorization.

1211562240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1211562240 is about 34807.5026395172. The cubic root of 1211562240 is about 1066.0606418644.

The spelling of 1211562240 in words is "one billion, two hundred eleven million, five hundred sixty-two thousand, two hundred forty".