4020046400 has 84 divisors (see below), whose sum is σ = 10054231860. Its totient is φ = 1581619200.

The previous prime is 4020046399. The next prime is 4020046409. The reversal of 4020046400 is 46400204.

It can be written as a sum of positive squares in 6 ways, for example, as 2173797376 + 1846249024 = 46624^2 + 42968^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (4020046409) 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, 77006 + ... + 118194.

Almost surely, 2^4020046400 is an apocalyptic number.

4020046400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4020046400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5027115930).

4020046400 is an abundant number, since it is smaller than the sum of its proper divisors (6034185460).

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

4020046400 is a wasteful number, since it uses less digits than its factorization.

4020046400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41272 (or 41257 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 4020046400 is about 63403.8358461063. The cubic root of 4020046400 is about 1590.0484407008.

Adding to 4020046400 its reverse (46400204), we get a palindrome (4066446604).

The spelling of 4020046400 in words is "four billion, twenty million, forty-six thousand, four hundred".