1918028385 has 96 divisors (see below), whose sum is σ = 4202714880. Its totient is φ = 787428864.

The previous prime is 1918028377. The next prime is 1918028389. The reversal of 1918028385 is 5838208191.

It is a happy number.

1918028385 is a `hidden beast` number, since 191 + 80 + 2 + 8 + 385 = 666.

It is not a de Polignac number, because 1918028385 - 2³ = 1918028377 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1918028385.

It is not an unprimeable number, because it can be changed into a prime (1918028389) 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, 145186 + ... + 157844.

It is an arithmetic number, because the mean of its divisors is an integer number (43778280).

Almost surely, 2^1918028385 is an apocalyptic number.

1918028385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1918028385 is an abundant number, since it is smaller than the sum of its proper divisors (2284686495).

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

1918028385 is a wasteful number, since it uses less digits than its factorization.

1918028385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12727 (or 12724 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 1918028385 is about 43795.3009465627. The cubic root of 1918028385 is about 1242.4674215204.

The spelling of 1918028385 in words is "one billion, nine hundred eighteen million, twenty-eight thousand, three hundred eighty-five".