398444729 has 4 divisors (see below), whose sum is σ = 399089040. Its totient is φ = 397800420.

The previous prime is 398444719. The next prime is 398444743. The reversal of 398444729 is 927444893.

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.

It is a cyclic number.

It is not a de Polignac number, because 398444729 - 2¹⁶ = 398379193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398444719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321227 + ... + 322464.

It is an arithmetic number, because the mean of its divisors is an integer number (99772260).

Almost surely, 2^398444729 is an apocalyptic number.

It is an amenable number.

398444729 is a deficient number, since it is larger than the sum of its proper divisors (644311).

398444729 is an equidigital number, since it uses as much as digits as its factorization.

398444729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644310.

The product of its digits is 1741824, while the sum is 50.

The square root of 398444729 is about 19961.0803565338. The cubic root of 398444729 is about 735.8501148242.

The spelling of 398444729 in words is "three hundred ninety-eight million, four hundred forty-four thousand, seven hundred twenty-nine".