1838549540 has 48 divisors (see below), whose sum is σ = 4039081200. Its totient is φ = 702062592.

The previous prime is 1838549539. The next prime is 1838549567. The reversal of 1838549540 is 459458381.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 153611236 + 1684938304 = 12394^2 + 41048^2 .

It is a super-2 number, since 2×1838549540² = 6760528822068423200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33812 + ... + 69428.

It is an arithmetic number, because the mean of its divisors is an integer number (84147525).

Almost surely, 2^1838549540 is an apocalyptic number.

1838549540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1838549540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2019540600).

1838549540 is an abundant number, since it is smaller than the sum of its proper divisors (2200531660).

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

1838549540 is a wasteful number, since it uses less digits than its factorization.

1838549540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35744 (or 35742 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 47.

The square root of 1838549540 is about 42878.3108342668. The cubic root of 1838549540 is about 1225.0630626982.

The spelling of 1838549540 in words is "one billion, eight hundred thirty-eight million, five hundred forty-nine thousand, five hundred forty".