1994211648 has 504 divisors, whose sum is σ = 7082869248. Its totient is φ = 532224000.

The previous prime is 1994211647. The next prime is 1994211649. The reversal of 1994211648 is 8461124991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1994211647) and next prime (1994211649).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994211643) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28087453 + ... + 28087523.

It is an arithmetic number, because the mean of its divisors is an integer number (14053312).

Almost surely, 2^1994211648 is an apocalyptic number.

1994211648 is a gapful number since it is divisible by the number (18) 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 1994211648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3541434624).

1994211648 is an abundant number, since it is smaller than the sum of its proper divisors (5088657600).

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

1994211648 is a wasteful number, since it uses less digits than its factorization.

1994211648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 131 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1994211648 is about 44656.5969146777. The cubic root of 1994211648 is about 1258.7043976488.

The spelling of 1994211648 in words is "one billion, nine hundred ninety-four million, two hundred eleven thousand, six hundred forty-eight".