1830121840 has 40 divisors (see below), whose sum is σ = 4256901648. Its totient is φ = 731727360.

The previous prime is 1830121691. The next prime is 1830121841. The reversal of 1830121840 is 481210381.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1830121799 and 1830121808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1830121841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276004 + ... + 282556.

Almost surely, 2^1830121840 is an apocalyptic number.

1830121840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1830121840 is an abundant number, since it is smaller than the sum of its proper divisors (2426779808).

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

1830121840 is a wasteful number, since it uses less digits than its factorization.

1830121840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10057 (or 10051 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 1830121840 is about 42779.9233285895. The cubic root of 1830121840 is about 1223.1883458030.

The spelling of 1830121840 in words is "one billion, eight hundred thirty million, one hundred twenty-one thousand, eight hundred forty".