401729 has 4 divisors (see below), whose sum is σ = 414720. Its totient is φ = 388740.

The previous prime is 401711. The next prime is 401743. The reversal of 401729 is 927104.

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 not a de Polignac number, because 401729 - 2⁸ = 401473 is a prime.

It is a super-2 number, since 2×401729² = 322772378882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6449 + ... + 6510.

It is an arithmetic number, because the mean of its divisors is an integer number (103680).

2⁴⁰¹⁷²⁹ is an apocalyptic number.

It is an amenable number.

401729 is a deficient number, since it is larger than the sum of its proper divisors (12991).

401729 is a wasteful number, since it uses less digits than its factorization.

401729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12990.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 401729 is about 633.8209526357. The cubic root of 401729 is about 73.7866388857.

The spelling of 401729 in words is "four hundred one thousand, seven hundred twenty-nine".