394365640 has 32 divisors (see below), whose sum is σ = 892296000. Its totient is φ = 156862144.

The previous prime is 394365611. The next prime is 394365641. The reversal of 394365640 is 46563493.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 394365593 and 394365602.

It is not an unprimeable number, because it can be changed into a prime (394365641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20380 + ... + 34699.

It is an arithmetic number, because the mean of its divisors is an integer number (27884250).

Almost surely, 2^394365640 is an apocalyptic number.

It is an amenable number.

394365640 is an abundant number, since it is smaller than the sum of its proper divisors (497930360).

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

394365640 is a wasteful number, since it uses less digits than its factorization.

394365640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55269 (or 55265 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 394365640 is about 19858.6414439659. The cubic root of 394365640 is about 733.3304012739.

The spelling of 394365640 in words is "three hundred ninety-four million, three hundred sixty-five thousand, six hundred forty".