406435816 has 8 divisors (see below), whose sum is σ = 762067170. Its totient is φ = 203217904.

The previous prime is 406435807. The next prime is 406435819. The reversal of 406435816 is 618534604.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 391644100 + 14791716 = 19790^2 + 3846^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (406435819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25402231 + ... + 25402246.

Almost surely, 2^406435816 is an apocalyptic number.

It is an amenable number.

406435816 is a deficient number, since it is larger than the sum of its proper divisors (355631354).

406435816 is a wasteful number, since it uses less digits than its factorization.

406435816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50804483 (or 50804479 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 406435816 is about 20160.2533714237. The cubic root of 406435816 is about 740.7369186941.

The spelling of 406435816 in words is "four hundred six million, four hundred thirty-five thousand, eight hundred sixteen".