401646520 has 64 divisors (see below), whose sum is σ = 1019887200. Its totient is φ = 141012480.

The previous prime is 401646473. The next prime is 401646527. The reversal of 401646520 is 25646104.

It is a super-2 number, since 2×401646520² = 322639854056220800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401646527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2979 + ... + 28498.

Almost surely, 2^401646520 is an apocalyptic number.

401646520 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 401646520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (509943600).

401646520 is an abundant number, since it is smaller than the sum of its proper divisors (618240680).

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

401646520 is a wasteful number, since it uses less digits than its factorization.

401646520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31528 (or 31524 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 401646520 is about 20041.1207271450. The cubic root of 401646520 is about 737.8158876609.

The spelling of 401646520 in words is "four hundred one million, six hundred forty-six thousand, five hundred twenty".