393921486 has 72 divisors (see below), whose sum is σ = 1004991624. Its totient is φ = 111172320.

The previous prime is 393921439. The next prime is 393921491. The reversal of 393921486 is 684129393.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 70516 + ... + 75896.

It is an arithmetic number, because the mean of its divisors is an integer number (13958217).

Almost surely, 2^393921486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 393921486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (502495812).

393921486 is an abundant number, since it is smaller than the sum of its proper divisors (611070138).

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

393921486 is a wasteful number, since it uses less digits than its factorization.

393921486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5486 (or 5476 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 393921486 is about 19847.4554036531. The cubic root of 393921486 is about 733.0549935878.

It can be divided in two parts, 3939 and 21486, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 393921486 in words is "three hundred ninety-three million, nine hundred twenty-one thousand, four hundred eighty-six".