398020834 has 4 divisors (see below), whose sum is σ = 597031254. Its totient is φ = 199010416.

The previous prime is 398020751. The next prime is 398020841. The reversal of 398020834 is 438020893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 438020893 = 5347 ⋅81919.

It can be written as a sum of positive squares in only one way, i.e., 241895809 + 156125025 = 15553^2 + 12495^2 .

It is a junction number, because it is equal to n+sod(n) for n = 398020793 and 398020802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99505207 + ... + 99505210.

Almost surely, 2^398020834 is an apocalyptic number.

398020834 is a deficient number, since it is larger than the sum of its proper divisors (199010420).

398020834 is a wasteful number, since it uses less digits than its factorization.

398020834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199010419.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 398020834 is about 19950.4594934553. The cubic root of 398020834 is about 735.5890716206.

The spelling of 398020834 in words is "three hundred ninety-eight million, twenty thousand, eight hundred thirty-four".