400036 has 36 divisors (see below), whose sum is σ = 882588. Its totient is φ = 157248.

The previous prime is 400033. The next prime is 400051. The reversal of 400036 is 630004.

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 313600 = 294^2 + 560^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

400036 is a modest number, since divided by 36 gives 4 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 399989 and 400025.

It is not an unprimeable number, because it can be changed into a prime (400031) 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, 2470 + ... + 2626.

2⁴⁰⁰⁰³⁶ 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 400036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441294).

400036 is an abundant number, since it is smaller than the sum of its proper divisors (482552).

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

400036 is a wasteful number, since it uses less digits than its factorization.

400036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 400036 is about 632.4839918923. The cubic root of 400036 is about 73.6828403254.

The spelling of 400036 in words is "four hundred thousand, thirty-six".