401231520 has 144 divisors (see below), whose sum is σ = 1386927360. Its totient is φ = 105610752.

The previous prime is 401231483. The next prime is 401231533. The reversal of 401231520 is 25132104.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 401231493 and 401231502.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111997 + ... + 115523.

It is an arithmetic number, because the mean of its divisors is an integer number (9631440).

Almost surely, 2^401231520 is an apocalyptic number.

401231520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401231520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693463680).

401231520 is an abundant number, since it is smaller than the sum of its proper divisors (985695840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401231520 is a wasteful number, since it uses less digits than its factorization.

401231520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627 (or 3616 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 401231520 is about 20030.7643388863. The cubic root of 401231520 is about 737.5616847764.

Adding to 401231520 its reverse (25132104), we get a palindrome (426363624).

The spelling of 401231520 in words is "four hundred one million, two hundred thirty-one thousand, five hundred twenty".