402340240 has 20 divisors (see below), whose sum is σ = 935441244. Its totient is φ = 160936064.

The previous prime is 402340231. The next prime is 402340243. The reversal of 402340240 is 42043204.

It can be written as a sum of positive squares in 2 ways, for example, as 258052096 + 144288144 = 16064^2 + 12012^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (402340243) 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 3 ways as a sum of consecutive naturals, for example, 2514547 + ... + 2514706.

Almost surely, 2^402340240 is an apocalyptic number.

402340240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402340240 is an abundant number, since it is smaller than the sum of its proper divisors (533101004).

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

402340240 is a wasteful number, since it uses less digits than its factorization.

402340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5029266 (or 5029260 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 402340240 is about 20058.4206756165. The cubic root of 402340240 is about 738.2404261661.

Adding to 402340240 its reverse (42043204), we get a palindrome (444383444).

The spelling of 402340240 in words is "four hundred two million, three hundred forty thousand, two hundred forty".