401655771 has 24 divisors (see below), whose sum is σ = 654741360. Its totient is φ = 235032000.

The previous prime is 401655743. The next prime is 401655797. The reversal of 401655771 is 177556104.

It is not a de Polignac number, because 401655771 - 2⁶ = 401655707 is a prime.

It is a super-2 number, since 2×401655771² = 322654716755208882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401655701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67080 + ... + 72821.

It is an arithmetic number, because the mean of its divisors is an integer number (27280890).

Almost surely, 2^401655771 is an apocalyptic number.

401655771 is a deficient number, since it is larger than the sum of its proper divisors (253085589).

401655771 is a wasteful number, since it uses less digits than its factorization.

401655771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139947 (or 139944 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 401655771 is about 20041.3515262819. The cubic root of 401655771 is about 737.8215522457.

The spelling of 401655771 in words is "four hundred one million, six hundred fifty-five thousand, seven hundred seventy-one".