1801671440 has 20 divisors (see below), whose sum is σ = 4188886284. Its totient is φ = 720668544.

The previous prime is 1801671367. The next prime is 1801671461. The reversal of 1801671440 is 441761081.

It can be written as a sum of positive squares in 2 ways, for example, as 850072336 + 951599104 = 29156^2 + 30848^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1801671397 and 1801671406.

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, 11260367 + ... + 11260526.

Almost surely, 2^1801671440 is an apocalyptic number.

1801671440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1801671440 is an abundant number, since it is smaller than the sum of its proper divisors (2387214844).

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

1801671440 is a wasteful number, since it uses less digits than its factorization.

1801671440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22520906 (or 22520900 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1801671440 is about 42446.1004098139. The cubic root of 1801671440 is about 1216.8168024730.

The spelling of 1801671440 in words is "one billion, eight hundred one million, six hundred seventy-one thousand, four hundred forty".