405980826 has 16 divisors (see below), whose sum is σ = 812168544. Its totient is φ = 135292464.

The previous prime is 405980819. The next prime is 405980851. The reversal of 405980826 is 628089504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30660 + ... + 41856.

It is an arithmetic number, because the mean of its divisors is an integer number (50760534).

Almost surely, 2^405980826 is an apocalyptic number.

405980826 is an abundant number, since it is smaller than the sum of its proper divisors (406187718).

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

405980826 is a wasteful number, since it uses less digits than its factorization.

405980826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17245.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 405980826 is about 20148.9658791711. The cubic root of 405980826 is about 740.4604062092.

The spelling of 405980826 in words is "four hundred five million, nine hundred eighty thousand, eight hundred twenty-six".