391443071040 has 896 divisors, whose sum is σ = 1637106647040. Its totient is φ = 86162227200.

The previous prime is 391443071029. The next prime is 391443071141. The reversal of 391443071040 is 40170344193.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 391443070986 and 391443071004.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 526840909 + ... + 526841651.

Almost surely, 2^391443071040 is an apocalyptic number.

391443071040 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 391443071040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818553323520).

391443071040 is an abundant number, since it is smaller than the sum of its proper divisors (1245663576000).

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

391443071040 is a wasteful number, since it uses less digits than its factorization.

391443071040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 391443071040 in words is "three hundred ninety-one billion, four hundred forty-three million, seventy-one thousand, forty".