1040402010440 has 128 divisors (see below), whose sum is σ = 2533619088000. Its totient is φ = 382224046080.

The previous prime is 1040402010433. The next prime is 1040402010463. The reversal of 1040402010440 is 440102040401.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 254312795 + ... + 254316885.

It is an arithmetic number, because the mean of its divisors is an integer number (19793899125).

Almost surely, 2^{1040402010440} is an apocalyptic number.

1040402010440 is a gapful number since it is divisible by the number (10) 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 1040402010440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266809544000).

1040402010440 is an abundant number, since it is smaller than the sum of its proper divisors (1493217077560).

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

1040402010440 is a wasteful number, since it uses less digits than its factorization.

1040402010440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447 (or 6443 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 1040402010440 its reverse (440102040401), we get a palindrome (1480504050841).

The spelling of 1040402010440 in words is "one trillion, forty billion, four hundred two million, ten thousand, four hundred forty".