398487380 has 48 divisors (see below), whose sum is σ = 895359360. Its totient is φ = 148521600.

The previous prime is 398487317. The next prime is 398487389. The reversal of 398487380 is 83784893.

398487380 = 2616² + 2617² + ... + 2672².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398487389) 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, 14585 + ... + 31775.

It is an arithmetic number, because the mean of its divisors is an integer number (18653320).

Almost surely, 2^398487380 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 398487380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447679680).

398487380 is an abundant number, since it is smaller than the sum of its proper divisors (496871980).

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

398487380 is a wasteful number, since it uses less digits than its factorization.

398487380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17280 (or 17278 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 398487380 is about 19962.1486819430. The cubic root of 398487380 is about 735.8763699282.

The spelling of 398487380 in words is "three hundred ninety-eight million, four hundred eighty-seven thousand, three hundred eighty".