994981440 has 224 divisors, whose sum is σ = 3428780544. Its totient is φ = 243466240.

The previous prime is 994981439. The next prime is 994981441. The reversal of 994981440 is 44189499.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (994981439) and next prime (994981441).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 994981440.

It is not an unprimeable number, because it can be changed into a prime (994981441) 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, 668377 + ... + 669863.

It is an arithmetic number, because the mean of its divisors is an integer number (15307056).

Almost surely, 2^994981440 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 994981440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1714390272).

994981440 is an abundant number, since it is smaller than the sum of its proper divisors (2433799104).

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

994981440 is a wasteful number, since it uses less digits than its factorization.

994981440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1555 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 994981440 is about 31543.3263940251. The cubic root of 994981440 is about 998.3243403999.

The spelling of 994981440 in words is "nine hundred ninety-four million, nine hundred eighty-one thousand, four hundred forty".