1118389440 has 224 divisors, whose sum is σ = 4145670144. Its totient is φ = 250122240.

The previous prime is 1118389409. The next prime is 1118389471. The reversal of 1118389440 is 449838111.

It is an interprime number because it is at equal distance from previous prime (1118389409) and next prime (1118389471).

It is a tau number, because it is divible by the number of its divisors (224).

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, 314070 + ... + 317610.

It is an arithmetic number, because the mean of its divisors is an integer number (18507456).

Almost surely, 2^1118389440 is an apocalyptic number.

1118389440 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 1118389440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2072835072).

1118389440 is an abundant number, since it is smaller than the sum of its proper divisors (3027280704).

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

1118389440 is a wasteful number, since it uses less digits than its factorization.

1118389440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615 (or 3605 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1118389440 is about 33442.3300623626. The cubic root of 1118389440 is about 1038.0007944722. Note that the first 3 decimals are identical.

It can be divided in two parts, 111838 and 9440, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 1118389440 in words is "one billion, one hundred eighteen million, three hundred eighty-nine thousand, four hundred forty".