399623583744 has 768 divisors, whose sum is σ = 1562982220800. Its totient is φ = 97674854400.

The previous prime is 399623583679. The next prime is 399623583797. The reversal of 399623583744 is 447385326993.

399623583744 is a `hidden beast` number, since 3 + 9 + 9 + 6 + 2 + 3 + 583 + 7 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 72379704 + ... + 72385224.

It is an arithmetic number, because the mean of its divisors is an integer number (2035133100).

Almost surely, 2^399623583744 is an apocalyptic number.

399623583744 is a gapful number since it is divisible by the number (34) 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 399623583744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781491110400).

399623583744 is an abundant number, since it is smaller than the sum of its proper divisors (1163358637056).

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

399623583744 is a wasteful number, since it uses less digits than its factorization.

399623583744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5587 (or 5561 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 63.

The spelling of 399623583744 in words is "three hundred ninety-nine billion, six hundred twenty-three million, five hundred eighty-three thousand, seven hundred forty-four".