401238531 has 18 divisors (see below), whose sum is σ = 582906012. Its totient is φ = 265957560.

The previous prime is 401238511. The next prime is 401238553. The reversal of 401238531 is 135832104.

It is a happy number.

401238531 is a `hidden beast` number, since 4 + 0 + 123 + 8 + 531 = 666.

It is not a de Polignac number, because 401238531 - 2¹³ = 401230339 is a prime.

It is a super-3 number, since 3×401238531³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 401238495 and 401238504.

It is not an unprimeable number, because it can be changed into a prime (401238511) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1093110 + ... + 1093476.

Almost surely, 2^401238531 is an apocalyptic number.

401238531 is a deficient number, since it is larger than the sum of its proper divisors (181667481).

401238531 is an equidigital number, since it uses as much as digits as its factorization.

401238531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 401238531 is about 20030.9393439249. The cubic root of 401238531 is about 737.5659807290.

The spelling of 401238531 in words is "four hundred one million, two hundred thirty-eight thousand, five hundred thirty-one".