399735439488 has 1152 divisors, whose sum is σ = 1534616928000. Its totient is φ = 98625945600.

The previous prime is 399735439487. The next prime is 399735439501. The reversal of 399735439488 is 884934537993.

399735439488 is a `hidden beast` number, since 3 + 9 + 9 + 73 + 543 + 9 + 4 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (399735439487) by changing a digit.

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 143 ways as a sum of consecutive naturals, for example, 1422545908 + ... + 1422546188.

It is an arithmetic number, because the mean of its divisors is an integer number (1332132750).

Almost surely, 2^399735439488 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 399735439488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767308464000).

399735439488 is an abundant number, since it is smaller than the sum of its proper divisors (1134881488512).

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

399735439488 is a wasteful number, since it uses less digits than its factorization.

399735439488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 412 counting only the distinct ones).

The product of its digits is 705438720, while the sum is 72.

The spelling of 399735439488 in words is "three hundred ninety-nine billion, seven hundred thirty-five million, four hundred thirty-nine thousand, four hundred eighty-eight".