400003667028 has 144 divisors (see below), whose sum is σ = 1159025352576. Its totient is φ = 113945253120.

The previous prime is 400003667027. The next prime is 400003667033. The reversal of 400003667028 is 820766300004.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 400003666983 and 400003667001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400003667027) 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, 148533250 + ... + 148535942.

Almost surely, 2^400003667028 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 400003667028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579512676288).

400003667028 is an abundant number, since it is smaller than the sum of its proper divisors (759021685548).

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

400003667028 is a wasteful number, since it uses less digits than its factorization.

400003667028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254 (or 4249 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The spelling of 400003667028 in words is "four hundred billion, three million, six hundred sixty-seven thousand, twenty-eight".