398928894 has 192 divisors, whose sum is σ = 1068134400. Its totient is φ = 99066240.

The previous prime is 398928889. The next prime is 398928911. The reversal of 398928894 is 498829893.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 10781844 + ... + 10781880.

It is an arithmetic number, because the mean of its divisors is an integer number (5563200).

Almost surely, 2^398928894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398928894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534067200).

398928894 is an abundant number, since it is smaller than the sum of its proper divisors (669205506).

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

398928894 is a wasteful number, since it uses less digits than its factorization.

398928894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 93 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 60.

The square root of 398928894 is about 19973.2043998954. The cubic root of 398928894 is about 736.1480471223.

Subtracting 398928894 from its reverse (498829893), we obtain a palindrome (99900999).

The spelling of 398928894 in words is "three hundred ninety-eight million, nine hundred twenty-eight thousand, eight hundred ninety-four".