1801672140 has 48 divisors (see below), whose sum is σ = 5056144128. Its totient is φ = 479354304.

The previous prime is 1801672129. The next prime is 1801672141. The reversal of 1801672140 is 412761081.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1801672098 and 1801672107.

It is not an unprimeable number, because it can be changed into a prime (1801672141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7312 + ... + 60471.

It is an arithmetic number, because the mean of its divisors is an integer number (105336336).

Almost surely, 2^1801672140 is an apocalyptic number.

1801672140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1801672140 is an abundant number, since it is smaller than the sum of its proper divisors (3254471988).

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

1801672140 is a wasteful number, since it uses less digits than its factorization.

1801672140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68238 (or 68236 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 1801672140 is about 42446.1086555646. The cubic root of 1801672140 is about 1216.8169600621.

The spelling of 1801672140 in words is "one billion, eight hundred one million, six hundred seventy-two thousand, one hundred forty".