401021550 has 96 divisors (see below), whose sum is σ = 1114214400. Its totient is φ = 106051680.

The previous prime is 401021461. The next prime is 401021557. The reversal of 401021550 is 55120104.

401021550 is a `hidden beast` number, since 401 + 0 + 215 + 50 = 666.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401021557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 170281 + ... + 172619.

It is an arithmetic number, because the mean of its divisors is an integer number (11606400).

Almost surely, 2^401021550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401021550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (557107200).

401021550 is an abundant number, since it is smaller than the sum of its proper divisors (713192850).

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

401021550 is a wasteful number, since it uses less digits than its factorization.

401021550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487 (or 2476 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 401021550 is about 20025.5224650944. The cubic root of 401021550 is about 737.4330035856.

Adding to 401021550 its reverse (55120104), we get a palindrome (456141654).

The spelling of 401021550 in words is "four hundred one million, twenty-one thousand, five hundred fifty".