1801919385 has 48 divisors (see below), whose sum is σ = 3726432000. Its totient is φ = 823731552.

The previous prime is 1801919381. The next prime is 1801919393. The reversal of 1801919385 is 5839191081.

1801919385 is a `hidden beast` number, since 1 + 80 + 191 + 9 + 385 = 666.

It is not a de Polignac number, because 1801919385 - 2² = 1801919381 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 1801919385.

It is not an unprimeable number, because it can be changed into a prime (1801919381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129585 + ... + 142814.

It is an arithmetic number, because the mean of its divisors is an integer number (77634000).

Almost surely, 2^1801919385 is an apocalyptic number.

1801919385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1801919385 is an abundant number, since it is smaller than the sum of its proper divisors (1924512615).

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

1801919385 is a wasteful number, since it uses less digits than its factorization.

1801919385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272427 (or 272414 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 45.

The square root of 1801919385 is about 42449.0210134462. The cubic root of 1801919385 is about 1216.8726191249.

The spelling of 1801919385 in words is "one billion, eight hundred one million, nine hundred nineteen thousand, three hundred eighty-five".