401440650 has 96 divisors (see below), whose sum is σ = 1081264128. Its totient is φ = 97977600.

The previous prime is 401440631. The next prime is 401440657. The reversal of 401440650 is 56044104.

It is a super-2 number, since 2×401440650² = 322309190944845000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401440650.

It is not an unprimeable number, because it can be changed into a prime (401440657) 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, 246840 + ... + 248460.

It is an arithmetic number, because the mean of its divisors is an integer number (11263168).

Almost surely, 2^401440650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401440650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (540632064).

401440650 is an abundant number, since it is smaller than the sum of its proper divisors (679823478).

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

401440650 is a wasteful number, since it uses less digits than its factorization.

401440650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1771 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 401440650 is about 20035.9838790113. The cubic root of 401440650 is about 737.6898065518.

Adding to 401440650 its reverse (56044104), we get a palindrome (457484754).

The spelling of 401440650 in words is "four hundred one million, four hundred forty thousand, six hundred fifty".