398932540 has 48 divisors (see below), whose sum is σ = 888959232. Its totient is φ = 149861376.

The previous prime is 398932519. The next prime is 398932553. The reversal of 398932540 is 45239893.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205414 + ... + 207346.

It is an arithmetic number, because the mean of its divisors is an integer number (18519984).

Almost surely, 2^398932540 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 398932540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (444479616).

398932540 is an abundant number, since it is smaller than the sum of its proper divisors (490026692).

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

398932540 is a wasteful number, since it uses less digits than its factorization.

398932540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 398932540 is about 19973.2956719716. The cubic root of 398932540 is about 736.1502897840.

The spelling of 398932540 in words is "three hundred ninety-eight million, nine hundred thirty-two thousand, five hundred forty".