398791926 has 48 divisors (see below), whose sum is σ = 941771376. Its totient is φ = 121220928.

The previous prime is 398791909. The next prime is 398791937. The reversal of 398791926 is 629197893.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9156 + ... + 29688.

It is an arithmetic number, because the mean of its divisors is an integer number (19620237).

Almost surely, 2^398791926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398791926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (470885688).

398791926 is an abundant number, since it is smaller than the sum of its proper divisors (542979450).

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

398791926 is a wasteful number, since it uses less digits than its factorization.

398791926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20637 (or 20634 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 398791926 is about 19969.7753117054. The cubic root of 398791926 is about 736.0637879399.

The spelling of 398791926 in words is "three hundred ninety-eight million, seven hundred ninety-one thousand, nine hundred twenty-six".