394909138 has 8 divisors (see below), whose sum is σ = 637930188. Its totient is φ = 182265744.

The previous prime is 394909127. The next prime is 394909157. The reversal of 394909138 is 831909493.

It can be written as a sum of positive squares in 2 ways, for example, as 323388289 + 71520849 = 17983^2 + 8457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7594381 + ... + 7594432.

Almost surely, 2^394909138 is an apocalyptic number.

394909138 is a deficient number, since it is larger than the sum of its proper divisors (243021050).

394909138 is a wasteful number, since it uses less digits than its factorization.

394909138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15188828.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 394909138 is about 19872.3209011932. The cubic root of 394909138 is about 733.6671282531.

The spelling of 394909138 in words is "three hundred ninety-four million, nine hundred nine thousand, one hundred thirty-eight".