402040644 has 48 divisors (see below), whose sum is σ = 983310720. Its totient is φ = 127607040.

The previous prime is 402040607. The next prime is 402040649. The reversal of 402040644 is 446040204.

It is not an unprimeable number, because it can be changed into a prime (402040649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 60024 + ... + 66384.

It is an arithmetic number, because the mean of its divisors is an integer number (20485640).

Almost surely, 2^402040644 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 402040644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (491655360).

402040644 is an abundant number, since it is smaller than the sum of its proper divisors (581270076).

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

402040644 is a wasteful number, since it uses less digits than its factorization.

402040644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6620 (or 6618 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 402040644 is about 20050.9511993820. The cubic root of 402040644 is about 738.0571411606.

Adding to 402040644 its reverse (446040204), we get a palindrome (848080848).

The spelling of 402040644 in words is "four hundred two million, forty thousand, six hundred forty-four".