401578 has 4 divisors (see below), whose sum is σ = 602370. Its totient is φ = 200788.

The previous prime is 401567. The next prime is 401587. The reversal of 401578 is 875104.

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

It can be written as a sum of positive squares in only one way, i.e., 321489 + 80089 = 567^2 + 283^2 .

It is a super-2 number, since 2×401578² = 322529780168, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100393 + ... + 100396.

2⁴⁰¹⁵⁷⁸ is an apocalyptic number.

401578 is a deficient number, since it is larger than the sum of its proper divisors (200792).

401578 is a wasteful number, since it uses less digits than its factorization.

401578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200791.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 401578 is about 633.7018226264. The cubic root of 401578 is about 73.7773928693. Note that the first 3 decimals are identical.

It can be divided in two parts, 401 and 578, that added together give a palindrome (979).

The spelling of 401578 in words is "four hundred one thousand, five hundred seventy-eight".