401655 has 8 divisors (see below), whose sum is σ = 642672. Its totient is φ = 214208.

The previous prime is 401651. The next prime is 401669. The reversal of 401655 is 556104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401655 - 2² = 401651 is a prime.

It is a super-2 number, since 2×401655² = 322653478050, which contains 22 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 13374 + ... + 13403.

It is an arithmetic number, because the mean of its divisors is an integer number (80334).

2⁴⁰¹⁶⁵⁵ is an apocalyptic number.

401655 is a deficient number, since it is larger than the sum of its proper divisors (241017).

401655 is a wasteful number, since it uses less digits than its factorization.

401655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26785.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 401655 is about 633.7625738398. The cubic root of 401655 is about 73.7821080149.

Adding to 401655 its reverse (556104), we get a palindrome (957759).

Subtracting 401655 from its reverse (556104), we obtain a square (154449 = 393²).

The spelling of 401655 in words is "four hundred one thousand, six hundred fifty-five".