16394797440 has 1024 divisors, whose sum is σ = 71066419200. Its totient is φ = 3491389440.

The previous prime is 16394797429. The next prime is 16394797487. The reversal of 16394797440 is 4479749361.

16394797440 is a `hidden beast` number, since 1 + 63 + 9 + 479 + 74 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 197527639 + ... + 197527721.

It is an arithmetic number, because the mean of its divisors is an integer number (69400800).

Almost surely, 2^16394797440 is an apocalyptic number.

16394797440 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 16394797440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35533209600).

16394797440 is an abundant number, since it is smaller than the sum of its proper divisors (54671621760).

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

16394797440 is a wasteful number, since it uses less digits than its factorization.

16394797440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 16394797440 in words is "sixteen billion, three hundred ninety-four million, seven hundred ninety-seven thousand, four hundred forty".