398856653 has 4 divisors (see below), whose sum is σ = 429537948. Its totient is φ = 368175360.

The previous prime is 398856649. The next prime is 398856659. The reversal of 398856653 is 356658893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356658893 = 929 ⋅383917.

It can be written as a sum of positive squares in 2 ways, for example, as 241429444 + 157427209 = 15538^2 + 12547^2 .

It is a cyclic number.

It is not a de Polignac number, because 398856653 - 2² = 398856649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398856595 and 398856604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398856659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15340628 + ... + 15340653.

It is an arithmetic number, because the mean of its divisors is an integer number (107384487).

Almost surely, 2^398856653 is an apocalyptic number.

It is an amenable number.

398856653 is a deficient number, since it is larger than the sum of its proper divisors (30681295).

398856653 is a wasteful number, since it uses less digits than its factorization.

398856653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30681294.

The product of its digits is 4665600, while the sum is 53.

The square root of 398856653 is about 19971.3958700938. The cubic root of 398856653 is about 736.1036087255.

The spelling of 398856653 in words is "three hundred ninety-eight million, eight hundred fifty-six thousand, six hundred fifty-three".