402440213401 has 4 divisors (see below), whose sum is σ = 412255828404. Its totient is φ = 392624598400.

The previous prime is 402440213387. The next prime is 402440213419. The reversal of 402440213401 is 104312044204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62312141376 + 340128072025 = 249624^2 + 583205^2 .

It is a cyclic number.

It is not a de Polignac number, because 402440213401 - 2¹⁵ = 402440180633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402440217401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4907807440 + ... + 4907807521.

It is an arithmetic number, because the mean of its divisors is an integer number (103063957101).

Almost surely, 2^402440213401 is an apocalyptic number.

402440213401 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

402440213401 is a deficient number, since it is larger than the sum of its proper divisors (9815615003).

402440213401 is an equidigital number, since it uses as much as digits as its factorization.

402440213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9815615002.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 402440213401 its reverse (104312044204), we get a palindrome (506752257605).

The spelling of 402440213401 in words is "four hundred two billion, four hundred forty million, two hundred thirteen thousand, four hundred one".