1894188420 has 72 divisors (see below), whose sum is σ = 5759033280. Its totient is φ = 503945280.

The previous prime is 1894188383. The next prime is 1894188421. The reversal of 1894188420 is 248814981.

1894188420 is a `hidden beast` number, since 189 + 41 + 8 + 8 + 420 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1894188421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67035 + ... + 91005.

Almost surely, 2^1894188420 is an apocalyptic number.

1894188420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1894188420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2879516640).

1894188420 is an abundant number, since it is smaller than the sum of its proper divisors (3864844860).

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

1894188420 is a wasteful number, since it uses less digits than its factorization.

1894188420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24425 (or 24420 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 1894188420 is about 43522.2749864940. The cubic root of 1894188420 is about 1237.2982321796.

The spelling of 1894188420 in words is "one billion, eight hundred ninety-four million, one hundred eighty-eight thousand, four hundred twenty".