394591540 has 48 divisors (see below), whose sum is σ = 954519552. Its totient is φ = 134217216.

The previous prime is 394591523. The next prime is 394591543. The reversal of 394591540 is 45195493.

It is a junction number, because it is equal to n+sod(n) for n = 394591493 and 394591502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394591543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6684 + ... + 28876.

It is an arithmetic number, because the mean of its divisors is an integer number (19885824).

Almost surely, 2^394591540 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 394591540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (477259776).

394591540 is an abundant number, since it is smaller than the sum of its proper divisors (559928012).

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

394591540 is a wasteful number, since it uses less digits than its factorization.

394591540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22336 (or 22334 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 394591540 is about 19864.3283299486. The cubic root of 394591540 is about 733.4703963275.

The spelling of 394591540 in words is "three hundred ninety-four million, five hundred ninety-one thousand, five hundred forty".