400340053 has 2 divisors, whose sum is σ = 400340054. Its totient is φ = 400340052.

The previous prime is 400340027. The next prime is 400340069. The reversal of 400340053 is 350043004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363397969 + 36942084 = 19063^2 + 6078^2 .

It is a cyclic number.

It is not a de Polignac number, because 400340053 - 2¹⁷ = 400208981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400340053.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400340023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200170026 + 200170027.

It is an arithmetic number, because the mean of its divisors is an integer number (200170027).

Almost surely, 2^400340053 is an apocalyptic number.

It is an amenable number.

400340053 is a deficient number, since it is larger than the sum of its proper divisors (1).

400340053 is an equidigital number, since it uses as much as digits as its factorization.

400340053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 400340053 is about 20008.4995189544. The cubic root of 400340053 is about 737.0150349156.

Adding to 400340053 its reverse (350043004), we get a palindrome (750383057).

The spelling of 400340053 in words is "four hundred million, three hundred forty thousand, fifty-three".