401155520 has 56 divisors (see below), whose sum is σ = 970958688. Its totient is φ = 157824000.

The previous prime is 401155501. The next prime is 401155523. The reversal of 401155520 is 25551104.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401155523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9245 + ... + 29795.

It is an arithmetic number, because the mean of its divisors is an integer number (17338548).

Almost surely, 2^401155520 is an apocalyptic number.

401155520 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 401155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485479344).

401155520 is an abundant number, since it is smaller than the sum of its proper divisors (569803168).

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

401155520 is a wasteful number, since it uses less digits than its factorization.

401155520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20629 (or 20619 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 401155520 is about 20028.8671671665. The cubic root of 401155520 is about 737.5151129719.

The spelling of 401155520 in words is "four hundred one million, one hundred fifty-five thousand, five hundred twenty".