405621796 has 24 divisors (see below), whose sum is σ = 718623416. Its totient is φ = 200309760.

The previous prime is 405621779. The next prime is 405621803. The reversal of 405621796 is 697126504.

It can be written as a sum of positive squares in 4 ways, for example, as 62631396 + 342990400 = 7914^2 + 18520^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293026 + ... + 294406.

Almost surely, 2^405621796 is an apocalyptic number.

It is an amenable number.

405621796 is a deficient number, since it is larger than the sum of its proper divisors (313001620).

405621796 is a wasteful number, since it uses less digits than its factorization.

405621796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239 (or 2237 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 405621796 is about 20140.0545182976. The cubic root of 405621796 is about 740.2420659258.

It can be divided in two parts, 4056 and 21796, that added together give a palindrome (25852).

The spelling of 405621796 in words is "four hundred five million, six hundred twenty-one thousand, seven hundred ninety-six".