1868821240 has 128 divisors (see below), whose sum is σ = 4973814720. Its totient is φ = 623001600.

The previous prime is 1868821177. The next prime is 1868821249. The reversal of 1868821240 is 421288681.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1868821193 and 1868821202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868821249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 897000 + ... + 899080.

Almost surely, 2^1868821240 is an apocalyptic number.

1868821240 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 1868821240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486907360).

1868821240 is an abundant number, since it is smaller than the sum of its proper divisors (3104993480).

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

1868821240 is a wasteful number, since it uses less digits than its factorization.

1868821240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273 (or 2269 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 1868821240 is about 43229.8651397388. The cubic root of 1868821240 is about 1231.7500459211.

The spelling of 1868821240 in words is "one billion, eight hundred sixty-eight million, eight hundred twenty-one thousand, two hundred forty".