401549809 has 8 divisors (see below), whose sum is σ = 425995848. Its totient is φ = 377195520.

The previous prime is 401549803. The next prime is 401549821. The reversal of 401549809 is 908945104.

It can be written as a sum of positive squares in 4 ways, for example, as 103469584 + 298080225 = 10172^2 + 17265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401549809 - 2⁹ = 401549297 is a prime.

It is a super-2 number, since 2×401549809² = 322484498215872962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401549803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13812 + ... + 31525.

It is an arithmetic number, because the mean of its divisors is an integer number (53249481).

Almost surely, 2^401549809 is an apocalyptic number.

It is an amenable number.

401549809 is a deficient number, since it is larger than the sum of its proper divisors (24446039).

401549809 is a wasteful number, since it uses less digits than its factorization.

401549809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45875.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 401549809 is about 20038.7077677180. The cubic root of 401549809 is about 737.7566642421.

It can be divided in two parts, 4015 and 49809, that added together give a square (53824 = 232²).

The spelling of 401549809 in words is "four hundred one million, five hundred forty-nine thousand, eight hundred nine".