398609872 has 80 divisors (see below), whose sum is σ = 854945280. Its totient is φ = 179379200.

The previous prime is 398609821. The next prime is 398609879. The reversal of 398609872 is 278906893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398609879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 437097 + ... + 438007.

It is an arithmetic number, because the mean of its divisors is an integer number (10686816).

Almost surely, 2^398609872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398609872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (427472640).

398609872 is an abundant number, since it is smaller than the sum of its proper divisors (456335408).

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

398609872 is a wasteful number, since it uses less digits than its factorization.

398609872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012 (or 1006 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 398609872 is about 19965.2165527950. The cubic root of 398609872 is about 735.9517631430.

The spelling of 398609872 in words is "three hundred ninety-eight million, six hundred nine thousand, eight hundred seventy-two".