1918872396 has 288 divisors, whose sum is σ = 6144768000. Its totient is φ = 507057408.

The previous prime is 1918872391. The next prime is 1918872413. The reversal of 1918872396 is 6932788191.

1918872396 is a `hidden beast` number, since 1 + 9 + 188 + 72 + 396 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1918872391) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21560320 + ... + 21560408.

It is an arithmetic number, because the mean of its divisors is an integer number (21336000).

Almost surely, 2^1918872396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918872396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3072384000).

1918872396 is an abundant number, since it is smaller than the sum of its proper divisors (4225895604).

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

1918872396 is a wasteful number, since it uses less digits than its factorization.

1918872396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 199 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1918872396 is about 43804.9357492966. The cubic root of 1918872396 is about 1242.6496403029.

The spelling of 1918872396 in words is "one billion, nine hundred eighteen million, eight hundred seventy-two thousand, three hundred ninety-six".