1618492840 has 24 divisors (see below), whose sum is σ = 3642181470. Its totient is φ = 647295360.

The previous prime is 1618492831. The next prime is 1618492847. The reversal of 1618492840 is 482948161.

It can be written as a sum of positive squares in 3 ways, for example, as 900360036 + 718132804 = 30006^2 + 26798^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1618492847) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 251260 + ... + 257620.

Almost surely, 2^1618492840 is an apocalyptic number.

1618492840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1618492840 is an abundant number, since it is smaller than the sum of its proper divisors (2023688630).

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

1618492840 is an frugal number, since it uses more digits than its factorization.

1618492840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12733 (or 6368 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1618492840 is about 40230.4963926621. The cubic root of 1618492840 is about 1174.0959613233.

The spelling of 1618492840 in words is "one billion, six hundred eighteen million, four hundred ninety-two thousand, eight hundred forty".