394502072836 has 27 divisors (see below), whose sum is σ = 697375129941. Its totient is φ = 195271912224.

The previous prime is 394502072831. The next prime is 394502072843. The reversal of 394502072836 is 638270205493.

The square root of 394502072836 is 628094.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 42520914436 + 351981158400 = 206206^2 + 593280^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394502072836.

It is not an unprimeable number, because it can be changed into a prime (394502072831) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 129385840 + ... + 129388888.

Almost surely, 2^394502072836 is an apocalyptic number.

394502072836 is the 628094-th square number.

It is an amenable number.

394502072836 is a deficient number, since it is larger than the sum of its proper divisors (302873057105).

394502072836 is an frugal number, since it uses more digits than its factorization.

394502072836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6308 (or 3154 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 49.

Multiplying 394502072836 by its sum of digits (49), we get a square (19330601568964 = 4396658²).

The spelling of 394502072836 in words is "three hundred ninety-four billion, five hundred two million, seventy-two thousand, eight hundred thirty-six".