401240028 has 96 divisors (see below), whose sum is σ = 1107993600. Its totient is φ = 112943040.

The previous prime is 401239939. The next prime is 401240029. The reversal of 401240028 is 820042104.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 401239986 and 401240013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401240029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291550 + ... + 292922.

It is an arithmetic number, because the mean of its divisors is an integer number (11541600).

Almost surely, 2^401240028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401240028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (553996800).

401240028 is an abundant number, since it is smaller than the sum of its proper divisors (706753572).

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

401240028 is a wasteful number, since it uses less digits than its factorization.

401240028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1456 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 401240028 is about 20030.9767110843. The cubic root of 401240028 is about 737.5668980013.

The spelling of 401240028 in words is "four hundred one million, two hundred forty thousand, twenty-eight".