394785764 has 24 divisors (see below), whose sum is σ = 745323768. Its totient is φ = 182274560.

The previous prime is 394785751. The next prime is 394785767. The reversal of 394785764 is 467587493.

It can be written as a sum of positive squares in 4 ways, for example, as 70425664 + 324360100 = 8392^2 + 18010^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (394785767) 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, 51167 + ... + 58374.

It is an arithmetic number, because the mean of its divisors is an integer number (31055157).

Almost surely, 2^394785764 is an apocalyptic number.

394785764 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

394785764 is a deficient number, since it is larger than the sum of its proper divisors (350538004).

394785764 is a wasteful number, since it uses less digits than its factorization.

394785764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109615 (or 109613 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 53.

The square root of 394785764 is about 19869.2164918499. The cubic root of 394785764 is about 733.5907183761.

The spelling of 394785764 in words is "three hundred ninety-four million, seven hundred eighty-five thousand, seven hundred sixty-four".