1871994240 has 192 divisors, whose sum is σ = 6704202960. Its totient is φ = 499156992.

The previous prime is 1871994233. The next prime is 1871994269. The reversal of 1871994240 is 424991781.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149502 + ... + 161538.

Almost surely, 2^1871994240 is an apocalyptic number.

1871994240 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 1871994240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3352101480).

1871994240 is an abundant number, since it is smaller than the sum of its proper divisors (4832208720).

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

1871994240 is an equidigital number, since it uses as much as digits as its factorization.

1871994240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12071 (or 12047 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1871994240 is about 43266.5487414931. The cubic root of 1871994240 is about 1232.4467654993.

The spelling of 1871994240 in words is "one billion, eight hundred seventy-one million, nine hundred ninety-four thousand, two hundred forty".