1994638240 has 192 divisors, whose sum is σ = 5757696000. Its totient is φ = 637756416.

The previous prime is 1994638201. The next prime is 1994638267. The reversal of 1994638240 is 428364991.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1425061 + ... + 1426459.

It is an arithmetic number, because the mean of its divisors is an integer number (29988000).

Almost surely, 2^1994638240 is an apocalyptic number.

1994638240 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 1994638240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2878848000).

1994638240 is an abundant number, since it is smaller than the sum of its proper divisors (3763057760).

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

1994638240 is a wasteful number, since it uses less digits than its factorization.

1994638240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 1994638240 is about 44661.3730196464. The cubic root of 1994638240 is about 1258.7941432122.

The spelling of 1994638240 in words is "one billion, nine hundred ninety-four million, six hundred thirty-eight thousand, two hundred forty".