394264428 has 12 divisors (see below), whose sum is σ = 919950360. Its totient is φ = 131421472.

The previous prime is 394264399. The next prime is 394264433. The reversal of 394264428 is 824462493.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 394264428.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16427673 + ... + 16427696.

It is an arithmetic number, because the mean of its divisors is an integer number (76662530).

Almost surely, 2^394264428 is an apocalyptic number.

It is an amenable number.

394264428 is an abundant number, since it is smaller than the sum of its proper divisors (525685932).

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

394264428 is a wasteful number, since it uses less digits than its factorization.

394264428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32855376 (or 32855374 counting only the distinct ones).

The product of its digits is 331776, while the sum is 42.

The square root of 394264428 is about 19856.0929691619. The cubic root of 394264428 is about 733.2676606938.

The spelling of 394264428 in words is "three hundred ninety-four million, two hundred sixty-four thousand, four hundred twenty-eight".