402020173 has 2 divisors, whose sum is σ = 402020174. Its totient is φ = 402020172.

The previous prime is 402020153. The next prime is 402020239. The reversal of 402020173 is 371020204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357890724 + 44129449 = 18918^2 + 6643^2 .

It is a cyclic number.

It is not a de Polignac number, because 402020173 - 2⁵ = 402020141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402020173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402020123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201010086 + 201010087.

It is an arithmetic number, because the mean of its divisors is an integer number (201010087).

Almost surely, 2^402020173 is an apocalyptic number.

It is an amenable number.

402020173 is a deficient number, since it is larger than the sum of its proper divisors (1).

402020173 is an equidigital number, since it uses as much as digits as its factorization.

402020173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 402020173 is about 20050.4407183483. The cubic root of 402020173 is about 738.0446142147.

Adding to 402020173 its reverse (371020204), we get a palindrome (773040377).

The spelling of 402020173 in words is "four hundred two million, twenty thousand, one hundred seventy-three".