398095640 has 64 divisors (see below), whose sum is σ = 923788800. Its totient is φ = 154315648.

The previous prime is 398095631. The next prime is 398095669. The reversal of 398095640 is 46590893.

It is a junction number, because it is equal to n+sod(n) for n = 398095591 and 398095600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200171 + ... + 202149.

It is an arithmetic number, because the mean of its divisors is an integer number (14434200).

Almost surely, 2^398095640 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 398095640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461894400).

398095640 is an abundant number, since it is smaller than the sum of its proper divisors (525693160).

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

398095640 is a wasteful number, since it uses less digits than its factorization.

398095640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144 (or 2140 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 398095640 is about 19952.3341992861. The cubic root of 398095640 is about 735.6351521474.

The spelling of 398095640 in words is "three hundred ninety-eight million, ninety-five thousand, six hundred forty".