402532240 has 80 divisors (see below), whose sum is σ = 1031112576. Its totient is φ = 144921600.

The previous prime is 402532237. The next prime is 402532243. The reversal of 402532240 is 42235204.

It is an interprime number because it is at equal distance from previous prime (402532237) and next prime (402532243).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (402532243) 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, 88420 + ... + 92860.

Almost surely, 2^402532240 is an apocalyptic number.

402532240 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 402532240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (515556288).

402532240 is an abundant number, since it is smaller than the sum of its proper divisors (628580336).

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

402532240 is a wasteful number, since it uses less digits than its factorization.

402532240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568 (or 4562 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 402532240 is about 20063.2061246452. The cubic root of 402532240 is about 738.3578389152.

Adding to 402532240 its reverse (42235204), we get a palindrome (444767444).

The spelling of 402532240 in words is "four hundred two million, five hundred thirty-two thousand, two hundred forty".