399247734079040 has 1120 divisors, whose sum is σ = 1251325611786240. Its totient is φ = 118709015040000.

The previous prime is 399247734078989. The next prime is 399247734079091. The reversal of 399247734079040 is 40970437742993.

It is an interprime number because it is at equal distance from previous prime (399247734078989) and next prime (399247734079091).

It is a tau number, because it is divible by the number of its divisors (1120).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 72183641075 + ... + 72183646605.

Almost surely, 2^{399247734079040} 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 399247734079040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (625662805893120).

399247734079040 is an abundant number, since it is smaller than the sum of its proper divisors (852077877707200).

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

399247734079040 is an equidigital number, since it uses as much as digits as its factorization.

399247734079040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5701 (or 5658 counting only the distinct ones).

The product of its (nonzero) digits is 288054144, while the sum is 68.

The spelling of 399247734079040 in words is "three hundred ninety-nine trillion, two hundred forty-seven billion, seven hundred thirty-four million, seventy-nine thousand, forty".