394503538 has 16 divisors (see below), whose sum is σ = 695209536. Its totient is φ = 165525840.

The previous prime is 394503533. The next prime is 394503553. The reversal of 394503538 is 835305493.

It is a self number, because there is not a number n which added to its sum of digits gives 394503538.

It is not an unprimeable number, because it can be changed into a prime (394503533) 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, 689406 + ... + 689977.

It is an arithmetic number, because the mean of its divisors is an integer number (43450596).

Almost surely, 2^394503538 is an apocalyptic number.

394503538 is a deficient number, since it is larger than the sum of its proper divisors (300705998).

394503538 is a wasteful number, since it uses less digits than its factorization.

394503538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379409.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 394503538 is about 19862.1131302790. The cubic root of 394503538 is about 733.4158659636.

The spelling of 394503538 in words is "three hundred ninety-four million, five hundred three thousand, five hundred thirty-eight".