394187746 has 4 divisors (see below), whose sum is σ = 591281622. Its totient is φ = 197093872.

The previous prime is 394187713. The next prime is 394187753. The reversal of 394187746 is 647781493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 647781493 = 71 ⋅9123683.

It can be written as a sum of positive squares in only one way, i.e., 389075625 + 5112121 = 19725^2 + 2261^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 394187746.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98546935 + ... + 98546938.

Almost surely, 2^394187746 is an apocalyptic number.

394187746 is a deficient number, since it is larger than the sum of its proper divisors (197093876).

394187746 is a wasteful number, since it uses less digits than its factorization.

394187746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197093875.

The product of its digits is 1016064, while the sum is 49.

The square root of 394187746 is about 19854.1619314440. The cubic root of 394187746 is about 733.2201189320.

The spelling of 394187746 in words is "three hundred ninety-four million, one hundred eighty-seven thousand, seven hundred forty-six".