1020400002402 has 128 divisors (see below), whose sum is σ = 2329743347712. Its totient is φ = 295217395200.

The previous prime is 1020400002383. The next prime is 1020400002407. The reversal of 1020400002402 is 2042000040201.

It is not an unprimeable number, because it can be changed into a prime (1020400002407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40749678 + ... + 40774710.

It is an arithmetic number, because the mean of its divisors is an integer number (18201119904).

Almost surely, 2^{1020400002402} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020400002402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1164871673856).

1020400002402 is an abundant number, since it is smaller than the sum of its proper divisors (1309343345310).

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

1020400002402 is a wasteful number, since it uses less digits than its factorization.

1020400002402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25416.

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 1020400002402 its reverse (2042000040201), we get a palindrome (3062400042603).

The spelling of 1020400002402 in words is "one trillion, twenty billion, four hundred million, two thousand, four hundred two".