401509 has 4 divisors (see below), whose sum is σ = 404320. Its totient is φ = 398700.

The previous prime is 401507. The next prime is 401519. The reversal of 401509 is 905104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401509 - 2¹ = 401507 is a prime.

It is a super-2 number, since 2×401509² = 322418954162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179 + ... + 1480.

It is an arithmetic number, because the mean of its divisors is an integer number (101080).

2⁴⁰¹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

401509 is a deficient number, since it is larger than the sum of its proper divisors (2811).

401509 is a wasteful number, since it uses less digits than its factorization.

401509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 401509 is about 633.6473782791. The cubic root of 401509 is about 73.7731670969.

The spelling of 401509 in words is "four hundred one thousand, five hundred nine".