1838933840 has 20 divisors (see below), whose sum is σ = 4275521364. Its totient is φ = 735573504.

The previous prime is 1838933783. The next prime is 1838933851. The reversal of 1838933840 is 483398381.

It can be written as a sum of positive squares in 2 ways, for example, as 1423100176 + 415833664 = 37724^2 + 20392^2 .

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

It is a congruent number.

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, 11493257 + ... + 11493416.

Almost surely, 2^1838933840 is an apocalyptic number.

1838933840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1838933840 is an abundant number, since it is smaller than the sum of its proper divisors (2436587524).

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

1838933840 is a wasteful number, since it uses less digits than its factorization.

1838933840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22986686 (or 22986680 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 1838933840 is about 42882.7918867230. The cubic root of 1838933840 is about 1225.1484123949.

The spelling of 1838933840 in words is "one billion, eight hundred thirty-eight million, nine hundred thirty-three thousand, eight hundred forty".