1813994424 has 96 divisors (see below), whose sum is σ = 5407225200. Its totient is φ = 544803840.

The previous prime is 1813994411. The next prime is 1813994437. The reversal of 1813994424 is 4244993181.

1813994424 is a `hidden beast` number, since 1 + 8 + 139 + 94 + 424 = 666.

It is an interprime number because it is at equal distance from previous prime (1813994411) and next prime (1813994437).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1813994424.

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, 79362 + ... + 99630.

Almost surely, 2^1813994424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1813994424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2703612600).

1813994424 is an abundant number, since it is smaller than the sum of its proper divisors (3593230776).

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

1813994424 is a wasteful number, since it uses less digits than its factorization.

1813994424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20405 (or 20398 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 1813994424 is about 42591.0134183257. The cubic root of 1813994424 is about 1219.5847426646.

The spelling of 1813994424 in words is "one billion, eight hundred thirteen million, nine hundred ninety-four thousand, four hundred twenty-four".