401564555 has 24 divisors (see below), whose sum is σ = 566029152. Its totient is φ = 272668032.

The previous prime is 401564551. The next prime is 401564557. The reversal of 401564555 is 555465104.

It is not a de Polignac number, because 401564555 - 2² = 401564551 is a prime.

It is a super-2 number, since 2×401564555² = 322508183664696050, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401564551) 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, 17279 + ... + 33191.

It is an arithmetic number, because the mean of its divisors is an integer number (23584548).

Almost surely, 2^401564555 is an apocalyptic number.

401564555 is a deficient number, since it is larger than the sum of its proper divisors (164464597).

401564555 is a wasteful number, since it uses less digits than its factorization.

401564555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16035 (or 16028 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 401564555 is about 20039.0757022374. The cubic root of 401564555 is about 737.7656949413.

The spelling of 401564555 in words is "four hundred one million, five hundred sixty-four thousand, five hundred fifty-five".