402144322440 has 64 divisors (see below), whose sum is σ = 1378780536960. Its totient is φ = 91918702080.

The previous prime is 402144322439. The next prime is 402144322441. The reversal of 402144322440 is 44223441204.

It is an interprime number because it is at equal distance from previous prime (402144322439) and next prime (402144322441).

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 = 402144322398 and 402144322407.

It is not an unprimeable number, because it can be changed into a prime (402144322441) 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 15 ways as a sum of consecutive naturals, for example, 239370781 + ... + 239372460.

It is an arithmetic number, because the mean of its divisors is an integer number (21543445890).

Almost surely, 2^402144322440 is an apocalyptic number.

402144322440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402144322440 is an abundant number, since it is smaller than the sum of its proper divisors (976636214520).

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

402144322440 is a wasteful number, since it uses less digits than its factorization.

402144322440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478743262 (or 478743258 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 402144322440 its reverse (44223441204), we get a palindrome (446367763644).

The spelling of 402144322440 in words is "four hundred two billion, one hundred forty-four million, three hundred twenty-two thousand, four hundred forty".