400185036 has 72 divisors (see below), whose sum is σ = 1085295120. Its totient is φ = 128786112.

The previous prime is 400184987. The next prime is 400185041. The reversal of 400185036 is 630581004.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21090 + ... + 35286.

Almost surely, 2^400185036 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 400185036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (542647560).

400185036 is an abundant number, since it is smaller than the sum of its proper divisors (685110084).

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

400185036 is a wasteful number, since it uses less digits than its factorization.

400185036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14245 (or 14231 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 400185036 is about 20004.6253651499. The cubic root of 400185036 is about 736.9198952892.

It can be divided in two parts, 40018 and 5036, that added together give a palindrome (45054).

The spelling of 400185036 in words is "four hundred million, one hundred eighty-five thousand, thirty-six".