398386253 has 4 divisors (see below), whose sum is σ = 412123740. Its totient is φ = 384648768.

The previous prime is 398386223. The next prime is 398386291. The reversal of 398386253 is 352683893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 352683893 = 43 ⋅8201951.

It can be written as a sum of positive squares in 2 ways, for example, as 280294564 + 118091689 = 16742^2 + 10867^2 .

It is a cyclic number.

It is not a de Polignac number, because 398386253 - 2¹⁸ = 398124109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398386198 and 398386207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398386223) 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, 6868700 + ... + 6868757.

It is an arithmetic number, because the mean of its divisors is an integer number (103030935).

Almost surely, 2^398386253 is an apocalyptic number.

It is an amenable number.

398386253 is a deficient number, since it is larger than the sum of its proper divisors (13737487).

398386253 is a wasteful number, since it uses less digits than its factorization.

398386253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13737486.

The product of its digits is 933120, while the sum is 47.

The square root of 398386253 is about 19959.6155524098. The cubic root of 398386253 is about 735.8141151205.

The spelling of 398386253 in words is "three hundred ninety-eight million, three hundred eighty-six thousand, two hundred fifty-three".