1618494840 has 96 divisors (see below), whose sum is σ = 5309394480. Its totient is φ = 427554816.

The previous prime is 1618494833. The next prime is 1618494853. The reversal of 1618494840 is 484948161.

1618494840 is a `hidden beast` number, since 161 + 8 + 4 + 9 + 484 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17512 + ... + 59528.

Almost surely, 2^1618494840 is an apocalyptic number.

1618494840 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 1618494840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2654697240).

1618494840 is an abundant number, since it is smaller than the sum of its proper divisors (3690899640).

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

1618494840 is a wasteful number, since it uses less digits than its factorization.

1618494840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42141 (or 42134 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 1618494840 is about 40230.5212494196. The cubic root of 1618494840 is about 1174.0964449401.

The spelling of 1618494840 in words is "one billion, six hundred eighteen million, four hundred ninety-four thousand, eight hundred forty".