398920853 has 2 divisors, whose sum is σ = 398920854. Its totient is φ = 398920852.

The previous prime is 398920831. The next prime is 398920859. The reversal of 398920853 is 358029893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271524484 + 127396369 = 16478^2 + 11287^2 .

It is a cyclic number.

It is not a de Polignac number, because 398920853 - 2¹⁴ = 398904469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398920798 and 398920807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398920859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199460426 + 199460427.

It is an arithmetic number, because the mean of its divisors is an integer number (199460427).

Almost surely, 2^398920853 is an apocalyptic number.

It is an amenable number.

398920853 is a deficient number, since it is larger than the sum of its proper divisors (1).

398920853 is an equidigital number, since it uses as much as digits as its factorization.

398920853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 398920853 is about 19973.0031041904. The cubic root of 398920853 is about 736.1431010394.

It can be divided in two parts, 3989 and 20853, that added together give a palindrome (24842).

The spelling of 398920853 in words is "three hundred ninety-eight million, nine hundred twenty thousand, eight hundred fifty-three".