400340404 has 6 divisors (see below), whose sum is σ = 700595714. Its totient is φ = 200170200.

The previous prime is 400340401. The next prime is 400340443. The reversal of 400340404 is 404043004.

It can be written as a sum of positive squares in only one way, i.e., 395930404 + 4410000 = 19898^2 + 2100^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400340401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50042547 + ... + 50042554.

Almost surely, 2^400340404 is an apocalyptic number.

It is an amenable number.

400340404 is a deficient number, since it is larger than the sum of its proper divisors (300255310).

400340404 is a wasteful number, since it uses less digits than its factorization.

400340404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100085105 (or 100085103 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400340404 is about 20008.5082902249. The cubic root of 400340404 is about 737.0152503093.

Adding to 400340404 its reverse (404043004), we get a palindrome (804383408).

The spelling of 400340404 in words is "four hundred million, three hundred forty thousand, four hundred four".