398278 has 16 divisors (see below), whose sum is σ = 645120. Its totient is φ = 183816.

The previous prime is 398273. The next prime is 398287. The reversal of 398278 is 872893.

398278 = T₆₂ + T₆₃ + ... + T₁₃₇.

398278 is a nontrivial binomial coefficient, being equal to C(893, 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1675 + ... + 1897.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2³⁹⁸²⁷⁸ is an apocalyptic number.

398278 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

398278 is the 892-nd triangular number.

398278 is the 298-th centered nonagonal number.

398278 is a deficient number, since it is larger than the sum of its proper divisors (246842).

398278 is a wasteful number, since it uses less digits than its factorization.

398278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291.

The product of its digits is 24192, while the sum is 37.

The square root of 398278 is about 631.0927031744. The cubic root of 398278 is about 73.5747461799.

It can be divided in two parts, 398 and 278, that added together give a palindrome (676).

The spelling of 398278 in words is "three hundred ninety-eight thousand, two hundred seventy-eight".