400260028 has 54 divisors (see below), whose sum is σ = 831621336. Its totient is φ = 168071904.

The previous prime is 400259987. The next prime is 400260067. The reversal of 400260028 is 820062004.

It is a junction number, because it is equal to n+sod(n) for n = 400259990 and 400260008.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 550201 + ... + 550927.

Almost surely, 2^400260028 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 400260028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (415810668).

400260028 is an abundant number, since it is smaller than the sum of its proper divisors (431361308).

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

400260028 is a wasteful number, since it uses less digits than its factorization.

400260028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 400260028 is about 20006.4996438657. The cubic root of 400260028 is about 736.9659237012.

The spelling of 400260028 in words is "four hundred million, two hundred sixty thousand, twenty-eight".