1018197540 has 120 divisors (see below), whose sum is σ = 3304418040. Its totient is φ = 262144512.

The previous prime is 1018197529. The next prime is 1018197601. The reversal of 1018197540 is 457918101.

1018197540 is a `hidden beast` number, since 10 + 18 + 1 + 97 + 540 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 394896384 + 623301156 = 19872^2 + 24966^2 .

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 = 1018197495 and 1018197504.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36144 + ... + 57816.

It is an arithmetic number, because the mean of its divisors is an integer number (27536817).

Almost surely, 2^1018197540 is an apocalyptic number.

1018197540 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 1018197540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652209020).

1018197540 is an abundant number, since it is smaller than the sum of its proper divisors (2286220500).

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

1018197540 is a wasteful number, since it uses less digits than its factorization.

1018197540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21723 (or 21712 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1018197540 is about 31909.2077620238. The cubic root of 1018197540 is about 1006.0294197004.

The spelling of 1018197540 in words is "one billion, eighteen million, one hundred ninety-seven thousand, five hundred forty".