406643946 has 16 divisors (see below), whose sum is σ = 818748000. Its totient is φ = 134637968.

The previous prime is 406643917. The next prime is 406643983. The reversal of 406643946 is 649346604.

It is a super-3 number, since 3×406643946³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 406643898 and 406643907.

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, 226536 + ... + 228323.

It is an arithmetic number, because the mean of its divisors is an integer number (51171750).

Almost surely, 2^406643946 is an apocalyptic number.

406643946 is an abundant number, since it is smaller than the sum of its proper divisors (412104054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

406643946 is a wasteful number, since it uses less digits than its factorization.

406643946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455013.

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 406643946 is about 20165.4146002506. The cubic root of 406643946 is about 740.8633373973.

The spelling of 406643946 in words is "four hundred six million, six hundred forty-three thousand, nine hundred forty-six".