398546389 has 4 divisors (see below), whose sum is σ = 403591360. Its totient is φ = 393501420.

The previous prime is 398546387. The next prime is 398546441. The reversal of 398546389 is 983645893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983645893 = 1097 ⋅896669.

It is a cyclic number.

It is not a de Polignac number, because 398546389 - 2¹ = 398546387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398546383) 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, 2522367 + ... + 2522524.

It is an arithmetic number, because the mean of its divisors is an integer number (100897840).

Almost surely, 2^398546389 is an apocalyptic number.

It is an amenable number.

398546389 is a deficient number, since it is larger than the sum of its proper divisors (5044971).

398546389 is an equidigital number, since it uses as much as digits as its factorization.

398546389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5044970.

The product of its digits is 5598720, while the sum is 55.

The square root of 398546389 is about 19963.6266494843. The cubic root of 398546389 is about 735.9126916017.

The spelling of 398546389 in words is "three hundred ninety-eight million, five hundred forty-six thousand, three hundred eighty-nine".