405640946 has 4 divisors (see below), whose sum is σ = 608461422. Its totient is φ = 202820472.

The previous prime is 405640931. The next prime is 405640997. The reversal of 405640946 is 649046504.

It is a happy number.

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., 392238025 + 13402921 = 19805^2 + 3661^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101410235 + ... + 101410238.

Almost surely, 2^405640946 is an apocalyptic number.

405640946 is a deficient number, since it is larger than the sum of its proper divisors (202820476).

405640946 is a wasteful number, since it uses less digits than its factorization.

405640946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202820475.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 405640946 is about 20140.5299334451. The cubic root of 405640946 is about 740.2537150471.

The spelling of 405640946 in words is "four hundred five million, six hundred forty thousand, nine hundred forty-six".