400202028 has 36 divisors (see below), whose sum is σ = 1022996520. Its totient is φ = 131900736.

The previous prime is 400202021. The next prime is 400202051. The reversal of 400202028 is 820202004.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×400202028³ (a number of 27 digits) contains 333 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 400202028.

It is not an unprimeable number, because it can be changed into a prime (400202021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59250 + ... + 65657.

It is an arithmetic number, because the mean of its divisors is an integer number (28416570).

Almost surely, 2^400202028 is an apocalyptic number.

It is an amenable number.

400202028 is an abundant number, since it is smaller than the sum of its proper divisors (622794492).

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

400202028 is a wasteful number, since it uses less digits than its factorization.

400202028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125006 (or 125001 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 400202028 is about 20005.0500624217. The cubic root of 400202028 is about 736.9303251025.

The spelling of 400202028 in words is "four hundred million, two hundred two thousand, twenty-eight".