402401390645 has 8 divisors (see below), whose sum is σ = 483562747320. Its totient is φ = 321467060160.

The previous prime is 402401390623. The next prime is 402401390647. The reversal of 402401390645 is 546093104204.

It can be written as a sum of positive squares in 4 ways, for example, as 36300156676 + 366101233969 = 190526^2 + 605063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402401390645 - 2¹⁸ = 402401128501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402401390599 and 402401390608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402401390647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56752646 + ... + 56759735.

It is an arithmetic number, because the mean of its divisors is an integer number (60445343415).

Almost surely, 2^402401390645 is an apocalyptic number.

It is an amenable number.

402401390645 is a deficient number, since it is larger than the sum of its proper divisors (81161356675).

402401390645 is a wasteful number, since it uses less digits than its factorization.

402401390645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113513095.

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 402401390645 its reverse (546093104204), we get a palindrome (948494494849).

The spelling of 402401390645 in words is "four hundred two billion, four hundred one million, three hundred ninety thousand, six hundred forty-five".