402240401 has 2 divisors, whose sum is σ = 402240402. Its totient is φ = 402240400.

The previous prime is 402240389. The next prime is 402240403. The reversal of 402240401 is 104042204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392000401 + 10240000 = 19799^2 + 3200^2 .

It is a cyclic number.

It is not a de Polignac number, because 402240401 - 2²² = 398046097 is a prime.

Together with 402240403, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402240401.

It is not a weakly prime, because it can be changed into another prime (402240403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201120200 + 201120201.

It is an arithmetic number, because the mean of its divisors is an integer number (201120201).

Almost surely, 2^402240401 is an apocalyptic number.

It is an amenable number.

402240401 is a deficient number, since it is larger than the sum of its proper divisors (1).

402240401 is an equidigital number, since it uses as much as digits as its factorization.

402240401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 402240401 is about 20055.9318157995. The cubic root of 402240401 is about 738.1793573857.

Adding to 402240401 its reverse (104042204), we get a palindrome (506282605).

The spelling of 402240401 in words is "four hundred two million, two hundred forty thousand, four hundred one".