401505609 has 16 divisors (see below), whose sum is σ = 586379520. Its totient is φ = 243237120.

The previous prime is 401505593. The next prime is 401505617. The reversal of 401505609 is 906505104.

It is not a de Polignac number, because 401505609 - 2⁴ = 401505593 is a prime.

It is a super-2 number, since 2×401505609² = 322413508116921762, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401545609) 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 15 ways as a sum of consecutive naturals, for example, 134257 + ... + 137214.

It is an arithmetic number, because the mean of its divisors is an integer number (36648720).

Almost surely, 2^401505609 is an apocalyptic number.

It is an amenable number.

401505609 is a deficient number, since it is larger than the sum of its proper divisors (184873911).

401505609 is a wasteful number, since it uses less digits than its factorization.

401505609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271520.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 401505609 is about 20037.6048718403. The cubic root of 401505609 is about 737.7295940917.

The spelling of 401505609 in words is "four hundred one million, five hundred five thousand, six hundred nine".