400065394 has 4 divisors (see below), whose sum is σ = 600098094. Its totient is φ = 200032696.

The previous prime is 400065307. The next prime is 400065409. The reversal of 400065394 is 493560004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 399480169 + 585225 = 19987^2 + 765^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100016347 + ... + 100016350.

Almost surely, 2^400065394 is an apocalyptic number.

400065394 is a deficient number, since it is larger than the sum of its proper divisors (200032700).

400065394 is a wasteful number, since it uses less digits than its factorization.

400065394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200032699.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 400065394 is about 20001.6347831871. The cubic root of 400065394 is about 736.8464497995.

The spelling of 400065394 in words is "four hundred million, sixty-five thousand, three hundred ninety-four".