394253640 has 96 divisors (see below), whose sum is σ = 1397822400. Its totient is φ = 95575680.

The previous prime is 394253617. The next prime is 394253641. The reversal of 394253640 is 46352493.

394253640 is a `hidden beast` number, since 3 + 9 + 4 + 2 + 5 + 3 + 640 = 666.

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 = 394253595 and 394253604.

It is not an unprimeable number, because it can be changed into a prime (394253641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45820 + ... + 53739.

It is an arithmetic number, because the mean of its divisors is an integer number (14560650).

Almost surely, 2^394253640 is an apocalyptic number.

394253640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394253640 is an abundant number, since it is smaller than the sum of its proper divisors (1003568760).

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

394253640 is a wasteful number, since it uses less digits than its factorization.

394253640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99587 (or 99580 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 394253640 is about 19855.8213126529. The cubic root of 394253640 is about 733.2609726581.

The spelling of 394253640 in words is "three hundred ninety-four million, two hundred fifty-three thousand, six hundred forty".