400063536 has 180 divisors, whose sum is σ = 1205640592. Its totient is φ = 128490624.

The previous prime is 400063523. The next prime is 400063553. The reversal of 400063536 is 635360004.

It is a super-3 number, since 3×400063536³ (a number of 27 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3884061 + ... + 3884163.

Almost surely, 2^400063536 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 400063536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602820296).

400063536 is an abundant number, since it is smaller than the sum of its proper divisors (805577056).

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

400063536 is an equidigital number, since it uses as much as digits as its factorization.

400063536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 400063536 is about 20001.5883369296. The cubic root of 400063536 is about 736.8453091003.

The spelling of 400063536 in words is "four hundred million, sixty-three thousand, five hundred thirty-six".