1854404020 has 36 divisors (see below), whose sum is σ = 4530046500. Its totient is φ = 635795328.

The previous prime is 1854403981. The next prime is 1854404099. The reversal of 1854404020 is 204044581.

It can be written as a sum of positive squares in 2 ways, for example, as 535552164 + 1318851856 = 23142^2 + 36316^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 1854404020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 945145 + ... + 947104.

It is an arithmetic number, because the mean of its divisors is an integer number (125834625).

Almost surely, 2^1854404020 is an apocalyptic number.

1854404020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1854404020 is an abundant number, since it is smaller than the sum of its proper divisors (2675642480).

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

1854404020 is a wasteful number, since it uses less digits than its factorization.

1854404020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892272 (or 1892263 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 1854404020 is about 43062.7915955294. The cubic root of 1854404020 is about 1228.5743766573.

The spelling of 1854404020 in words is "one billion, eight hundred fifty-four million, four hundred four thousand, twenty".