401659 has 4 divisors (see below), whose sum is σ = 425304. Its totient is φ = 378016.

The previous prime is 401651. The next prime is 401669. The reversal of 401659 is 956104.

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

It is a cyclic number.

It is not a de Polignac number, because 401659 - 2³ = 401651 is a prime.

It is a super-2 number, since 2×401659² = 322659904562, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401651) 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, 11797 + ... + 11830.

It is an arithmetic number, because the mean of its divisors is an integer number (106326).

2⁴⁰¹⁶⁵⁹ is an apocalyptic number.

401659 is a deficient number, since it is larger than the sum of its proper divisors (23645).

401659 is a wasteful number, since it uses less digits than its factorization.

401659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23644.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 401659 is about 633.7657295878. The cubic root of 401659 is about 73.7823529411.

The spelling of 401659 in words is "four hundred one thousand, six hundred fifty-nine".