402131240 has 96 divisors (see below), whose sum is σ = 1058832000. Its totient is φ = 137047680.

The previous prime is 402131237. The next prime is 402131267. The reversal of 402131240 is 42131204.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 389525 + ... + 390555.

It is an arithmetic number, because the mean of its divisors is an integer number (11029500).

Almost surely, 2^402131240 is an apocalyptic number.

402131240 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 402131240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (529416000).

402131240 is an abundant number, since it is smaller than the sum of its proper divisors (656700760).

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

402131240 is a wasteful number, since it uses less digits than its factorization.

402131240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255 (or 1244 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 402131240 is about 20053.2102168206. The cubic root of 402131240 is about 738.1125750278.

Adding to 402131240 its reverse (42131204), we get a palindrome (444262444).

The spelling of 402131240 in words is "four hundred two million, one hundred thirty-one thousand, two hundred forty".