401709 has 32 divisors (see below), whose sum is σ = 700416. Its totient is φ = 198720.

The previous prime is 401707. The next prime is 401711. The reversal of 401709 is 907104.

It is an interprime number because it is at equal distance from previous prime (401707) and next prime (401711).

It is not a de Polignac number, because 401709 - 2¹ = 401707 is a prime.

It is a super-2 number, since 2×401709² = 322740241362, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8524 + ... + 8570.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2⁴⁰¹⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

401709 is a deficient number, since it is larger than the sum of its proper divisors (298707).

401709 is a wasteful number, since it uses less digits than its factorization.

401709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 401709 is about 633.8051751130. The cubic root of 401709 is about 73.7854143809.

The spelling of 401709 in words is "four hundred one thousand, seven hundred nine".