401506 has 24 divisors (see below), whose sum is σ = 744876. Its totient is φ = 161280.

The previous prime is 401477. The next prime is 401507. The reversal of 401506 is 605104.

It can be written as a sum of positive squares in 2 ways, for example, as 370881 + 30625 = 609^2 + 175^2 .

It is a super-2 number, since 2×401506² = 322414136072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1546 + ... + 1786.

2⁴⁰¹⁵⁰⁶ is an apocalyptic number.

401506 is a deficient number, since it is larger than the sum of its proper divisors (343370).

401506 is a wasteful number, since it uses less digits than its factorization.

401506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 401506 is about 633.6450110275. The cubic root of 401506 is about 73.7729833567.

The spelling of 401506 in words is "four hundred one thousand, five hundred six".