400426001 has 2 divisors, whose sum is σ = 400426002. Its totient is φ = 400426000.

The previous prime is 400425989. The next prime is 400426003. The reversal of 400426001 is 100624004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331203601 + 69222400 = 18199^2 + 8320^2 .

It is a cyclic number.

It is not a de Polignac number, because 400426001 - 2¹⁴ = 400409617 is a prime.

Together with 400426003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400426003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200213000 + 200213001.

It is an arithmetic number, because the mean of its divisors is an integer number (200213001).

Almost surely, 2^400426001 is an apocalyptic number.

It is an amenable number.

400426001 is a deficient number, since it is larger than the sum of its proper divisors (1).

400426001 is an equidigital number, since it uses as much as digits as its factorization.

400426001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 400426001 is about 20010.6471909331. The cubic root of 400426001 is about 737.0677737769.

It can be divided in two parts, 40042 and 6001, that multiplied together give a palindrome (240292042).

The spelling of 400426001 in words is "four hundred million, four hundred twenty-six thousand, one".