398258278 has 16 divisors (see below), whose sum is σ = 685995840. Its totient is φ = 171498600.

The previous prime is 398258261. The next prime is 398258281. The reversal of 398258278 is 872852893.

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 7 ways as a sum of consecutive naturals, for example, 475968 + ... + 476803.

It is an arithmetic number, because the mean of its divisors is an integer number (42874740).

Almost surely, 2^398258278 is an apocalyptic number.

398258278 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

398258278 is a deficient number, since it is larger than the sum of its proper divisors (287737562).

398258278 is a wasteful number, since it uses less digits than its factorization.

398258278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952803.

The product of its digits is 1935360, while the sum is 52.

The square root of 398258278 is about 19956.4094465913. The cubic root of 398258278 is about 735.7353173076.

The spelling of 398258278 in words is "three hundred ninety-eight million, two hundred fifty-eight thousand, two hundred seventy-eight".