391000050 has 288 divisors, whose sum is σ = 1299916800. Its totient is φ = 82270080.

The previous prime is 391000033. The next prime is 391000061. The reversal of 391000050 is 50000193.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 390999987 and 391000032.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2812881 + ... + 2813019.

It is an arithmetic number, because the mean of its divisors is an integer number (4513600).

Almost surely, 2^391000050 is an apocalyptic number.

391000050 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 391000050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (649958400).

391000050 is an abundant number, since it is smaller than the sum of its proper divisors (908916750).

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

391000050 is a wasteful number, since it uses less digits than its factorization.

391000050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 391000050 is about 19773.7211975895. The cubic root of 391000050 is about 731.2383123269.

The spelling of 391000050 in words is "three hundred ninety-one million, fifty", and thus it is an aban number.