1620138018 has 64 divisors (see below), whose sum is σ = 3523092480. Its totient is φ = 494942400.

The previous prime is 1620138007. The next prime is 1620138043. The reversal of 1620138018 is 8108310261.

It is a Curzon number.

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, 804633 + ... + 806643.

It is an arithmetic number, because the mean of its divisors is an integer number (55048320).

Almost surely, 2^1620138018 is an apocalyptic number.

1620138018 is an abundant number, since it is smaller than the sum of its proper divisors (1902954462).

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

1620138018 is a wasteful number, since it uses less digits than its factorization.

1620138018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1620138018 is about 40250.9381008692. The cubic root of 1620138018 is about 1174.4936446259.

Adding to 1620138018 its reverse (8108310261), we get a palindrome (9728448279).

The spelling of 1620138018 in words is "one billion, six hundred twenty million, one hundred thirty-eight thousand, eighteen".