401056309 has 4 divisors (see below), whose sum is σ = 401131116. Its totient is φ = 400981504.

The previous prime is 401056307. The next prime is 401056319. The reversal of 401056309 is 903650104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158382225 + 242674084 = 12585^2 + 15578^2 .

It is a cyclic number.

It is not a de Polignac number, because 401056309 - 2¹ = 401056307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401056303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28684 + ... + 40309.

It is an arithmetic number, because the mean of its divisors is an integer number (100282779).

Almost surely, 2^401056309 is an apocalyptic number.

It is an amenable number.

401056309 is a deficient number, since it is larger than the sum of its proper divisors (74807).

401056309 is an equidigital number, since it uses as much as digits as its factorization.

401056309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74806.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 401056309 is about 20026.3903137835. The cubic root of 401056309 is about 737.4543089188.

The spelling of 401056309 in words is "four hundred one million, fifty-six thousand, three hundred nine".