398639850 has 192 divisors, whose sum is σ = 1201446912. Its totient is φ = 85536000.

The previous prime is 398639837. The next prime is 398639873. The reversal of 398639850 is 58936893.

It is a junction number, because it is equal to n+sod(n) for n = 398639793 and 398639802.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1204185 + ... + 1204515.

It is an arithmetic number, because the mean of its divisors is an integer number (6257536).

Almost surely, 2^398639850 is an apocalyptic number.

398639850 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 398639850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (600723456).

398639850 is an abundant number, since it is smaller than the sum of its proper divisors (802807062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398639850 is a wasteful number, since it uses less digits than its factorization.

398639850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 398639850 is about 19965.9672943737. The cubic root of 398639850 is about 735.9702120998.

The spelling of 398639850 in words is "three hundred ninety-eight million, six hundred thirty-nine thousand, eight hundred fifty".