402002240 has 56 divisors (see below), whose sum is σ = 970437480. Its totient is φ = 158588928.

The previous prime is 402002221. The next prime is 402002243. The reversal of 402002240 is 42200204.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42823936 + 359178304 = 6544^2 + 18952^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402002243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14756 + ... + 31964.

Almost surely, 2^402002240 is an apocalyptic number.

402002240 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 402002240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485218740).

402002240 is an abundant number, since it is smaller than the sum of its proper divisors (568435240).

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

402002240 is a wasteful number, since it uses less digits than its factorization.

402002240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17299 (or 17289 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 402002240 is about 20049.9935162084. The cubic root of 402002240 is about 738.0336400135.

Adding to 402002240 its reverse (42200204), we get a palindrome (444202444).

The spelling of 402002240 in words is "four hundred two million, two thousand, two hundred forty".