398456645 has 18 divisors (see below), whose sum is σ = 488600658. Its totient is φ = 311945088.

The previous prime is 398456603. The next prime is 398456683. The reversal of 398456645 is 546654893.

It can be written as a sum of positive squares in 3 ways, for example, as 41964484 + 356492161 = 6478^2 + 18881^2 .

It is not a de Polignac number, because 398456645 - 2²⁶ = 331347781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 398456593 and 398456602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3526109 + ... + 3526221.

It is an arithmetic number, because the mean of its divisors is an integer number (27144481).

Almost surely, 2^398456645 is an apocalyptic number.

It is an amenable number.

398456645 is a deficient number, since it is larger than the sum of its proper divisors (90144013).

398456645 is an frugal number, since it uses more digits than its factorization.

398456645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 197 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 50.

The square root of 398456645 is about 19961.3788351406. The cubic root of 398456645 is about 735.8574502645.

The spelling of 398456645 in words is "three hundred ninety-eight million, four hundred fifty-six thousand, six hundred forty-five".