1918420028 has 12 divisors (see below), whose sum is σ = 3836840112. Its totient is φ = 822180000.

The previous prime is 1918419991. The next prime is 1918420033. The reversal of 1918420028 is 8200248191.

1918420028 is an admirable number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1918420028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34257473 + ... + 34257528.

It is an arithmetic number, because the mean of its divisors is an integer number (319736676).

Almost surely, 2^1918420028 is an apocalyptic number.

It is an amenable number.

1918420028 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1918420028 is a wasteful number, since it uses less digits than its factorization.

1918420028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68515012 (or 68515010 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1918420028 is about 43799.7720085390. The cubic root of 1918420028 is about 1242.5519824087.

The spelling of 1918420028 in words is "one billion, nine hundred eighteen million, four hundred twenty thousand, twenty-eight".