402490005240 has 128 divisors (see below), whose sum is σ = 1236092140800. Its totient is φ = 104788669440.

The previous prime is 402490005221. The next prime is 402490005289. The reversal of 402490005240 is 42500094204.

It is a Cunningham number, because it is equal to 634421²-1.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 402490005198 and 402490005207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12672580 + ... + 12704300.

It is an arithmetic number, because the mean of its divisors is an integer number (9656969850).

Almost surely, 2^402490005240 is an apocalyptic number.

402490005240 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 402490005240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (618046070400).

402490005240 is an abundant number, since it is smaller than the sum of its proper divisors (833602135560).

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

402490005240 is a wasteful number, since it uses less digits than its factorization.

402490005240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34237 (or 34233 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 402490005240 its reverse (42500094204), we get a palindrome (444990099444).

The spelling of 402490005240 in words is "four hundred two billion, four hundred ninety million, five thousand, two hundred forty".