1018189440 has 192 divisors, whose sum is σ = 3646712160. Its totient is φ = 271475712.

The previous prime is 1018189409. The next prime is 1018189453. The reversal of 1018189440 is 449818101.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1018189395 and 1018189404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152247 + ... + 158793.

Almost surely, 2^1018189440 is an apocalyptic number.

1018189440 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 1018189440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1823356080).

1018189440 is an abundant number, since it is smaller than the sum of its proper divisors (2628522720).

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

1018189440 is an frugal number, since it uses more digits than its factorization.

1018189440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6581 (or 6557 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1018189440 is about 31909.0808391593. The cubic root of 1018189440 is about 1006.0267519601.

The spelling of 1018189440 in words is "one billion, eighteen million, one hundred eighty-nine thousand, four hundred forty".