1113521240 has 128 divisors (see below), whose sum is σ = 2829496320. Its totient is φ = 391564800.

The previous prime is 1113521221. The next prime is 1113521257. The reversal of 1113521240 is 421253111.

It is a super-2 number, since 2×1113521240² = 2479859103862275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 1079525 + ... + 1080555.

It is an arithmetic number, because the mean of its divisors is an integer number (22105440).

Almost surely, 2^1113521240 is an apocalyptic number.

1113521240 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 1113521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1414748160).

1113521240 is an abundant number, since it is smaller than the sum of its proper divisors (1715975080).

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

1113521240 is a wasteful number, since it uses less digits than its factorization.

1113521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153 (or 1149 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1113521240 is about 33369.4656834658. The cubic root of 1113521240 is about 1036.4925109141.

Adding to 1113521240 its reverse (421253111), we get a palindrome (1534774351).

The spelling of 1113521240 in words is "one billion, one hundred thirteen million, five hundred twenty-one thousand, two hundred forty".