400404794 has 4 divisors (see below), whose sum is σ = 600607194. Its totient is φ = 200202396.

The previous prime is 400404779. The next prime is 400404799. The reversal of 400404794 is 497404004.

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., 397803025 + 2601769 = 19945^2 + 1613^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400404794.

It is not an unprimeable number, because it can be changed into a prime (400404799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100101197 + ... + 100101200.

Almost surely, 2^400404794 is an apocalyptic number.

400404794 is a deficient number, since it is larger than the sum of its proper divisors (200202400).

400404794 is a wasteful number, since it uses less digits than its factorization.

400404794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200202399.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 400404794 is about 20010.1172910106. The cubic root of 400404794 is about 737.0547615748.

Adding to 400404794 its reverse (497404004), we get a palindrome (897808798).

The spelling of 400404794 in words is "four hundred million, four hundred four thousand, seven hundred ninety-four".