398172053 has 2 divisors, whose sum is σ = 398172054. Its totient is φ = 398172052.

The previous prime is 398172041. The next prime is 398172083. The reversal of 398172053 is 350271893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277655569 + 120516484 = 16663^2 + 10978^2 .

It is a cyclic number.

It is not a de Polignac number, because 398172053 - 2⁶ = 398171989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 398171998 and 398172016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398172013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199086026 + 199086027.

It is an arithmetic number, because the mean of its divisors is an integer number (199086027).

Almost surely, 2^398172053 is an apocalyptic number.

It is an amenable number.

398172053 is a deficient number, since it is larger than the sum of its proper divisors (1).

398172053 is an equidigital number, since it uses as much as digits as its factorization.

398172053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 398172053 is about 19954.2489961411. The cubic root of 398172053 is about 735.6822166273.

The spelling of 398172053 in words is "three hundred ninety-eight million, one hundred seventy-two thousand, fifty-three".