398029085 has 4 divisors (see below), whose sum is σ = 477634908. Its totient is φ = 318423264.

The previous prime is 398029067. The next prime is 398029103. The reversal of 398029085 is 580920893.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (398029067) and next prime (398029103).

It can be written as a sum of positive squares in 2 ways, for example, as 257345764 + 140683321 = 16042^2 + 11861^2 .

It is a cyclic number.

It is not a de Polignac number, because 398029085 - 2¹⁴ = 398012701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39802904 + ... + 39802913.

It is an arithmetic number, because the mean of its divisors is an integer number (119408727).

Almost surely, 2^398029085 is an apocalyptic number.

It is an amenable number.

398029085 is a deficient number, since it is larger than the sum of its proper divisors (79605823).

398029085 is an equidigital number, since it uses as much as digits as its factorization.

398029085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79605822.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 398029085 is about 19950.6662796008. Note that the first 3 decimals coincide. The cubic root of 398029085 is about 735.5941545233.

The spelling of 398029085 in words is "three hundred ninety-eight million, twenty-nine thousand, eighty-five".