391849920000 has 3200 divisors, whose sum is σ = 1963531468800. Its totient is φ = 74649600000.

The previous prime is 391849919983. The next prime is 391849920067. The reversal of 391849920000 is 29948193.

It is a tau number, because it is divible by the number of its divisors (3200).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 12640319985 + ... + 12640320015.

It is an arithmetic number, because the mean of its divisors is an integer number (613603584).

Almost surely, 2^391849920000 is an apocalyptic number.

391849920000 is a gapful number since it is divisible by the number (30) 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 391849920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (981765734400).

391849920000 is an abundant number, since it is smaller than the sum of its proper divisors (1571681548800).

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

391849920000 is a wasteful number, since it uses less digits than its factorization.

391849920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 391849920000 in words is "three hundred ninety-one billion, eight hundred forty-nine million, nine hundred twenty thousand".