406400636 has 24 divisors (see below), whose sum is σ = 726277440. Its totient is φ = 198934272.

The previous prime is 406400581. The next prime is 406400641. The reversal of 406400636 is 636004604.

It is a super-2 number, since 2×406400636² = 330322953882408992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 406400599 and 406400608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34925 + ... + 45083.

It is an arithmetic number, because the mean of its divisors is an integer number (30261560).

Almost surely, 2^406400636 is an apocalyptic number.

It is an amenable number.

406400636 is a deficient number, since it is larger than the sum of its proper divisors (319876804).

406400636 is a wasteful number, since it uses less digits than its factorization.

406400636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10373 (or 10371 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 406400636 is about 20159.3808436668. The cubic root of 406400636 is about 740.7155460069.

The spelling of 406400636 in words is "four hundred six million, four hundred thousand, six hundred thirty-six".