1838905040 has 80 divisors (see below), whose sum is σ = 4953278208. Its totient is φ = 621831168.

The previous prime is 1838905021. The next prime is 1838905043. The reversal of 1838905040 is 405098381.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1838905040² = 6763143492274803200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1838904985 and 1838905003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1838905043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18389 + ... + 63371.

Almost surely, 2^1838905040 is an apocalyptic number.

1838905040 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 1838905040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2476639104).

1838905040 is an abundant number, since it is smaller than the sum of its proper divisors (3114373168).

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

1838905040 is a wasteful number, since it uses less digits than its factorization.

1838905040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45076 (or 45070 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1838905040 is about 42882.4560863764. The cubic root of 1838905040 is about 1225.1420165769.

The spelling of 1838905040 in words is "one billion, eight hundred thirty-eight million, nine hundred five thousand, forty".