401655405 has 16 divisors (see below), whose sum is σ = 643124160. Its totient is φ = 214057728.

The previous prime is 401655361. The next prime is 401655409. The reversal of 401655405 is 504556104.

It is not a de Polignac number, because 401655405 - 2⁶ = 401655341 is a prime.

It is a super-2 number, since 2×401655405² = 322654128731428050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401655409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12709 + ... + 31061.

It is an arithmetic number, because the mean of its divisors is an integer number (40195260).

Almost surely, 2^401655405 is an apocalyptic number.

It is an amenable number.

401655405 is a deficient number, since it is larger than the sum of its proper divisors (241468755).

401655405 is a wasteful number, since it uses less digits than its factorization.

401655405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19820.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 401655405 is about 20041.3423951591. The cubic root of 401655405 is about 737.8213281378.

The spelling of 401655405 in words is "four hundred one million, six hundred fifty-five thousand, four hundred five".