398099540 has 48 divisors (see below), whose sum is σ = 895914432. Its totient is φ = 148056576.

The previous prime is 398099531. The next prime is 398099563. The reversal of 398099540 is 45990893.

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, 21167 + ... + 35273.

It is an arithmetic number, because the mean of its divisors is an integer number (18664884).

Almost surely, 2^398099540 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 398099540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447957216).

398099540 is an abundant number, since it is smaller than the sum of its proper divisors (497814892).

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

398099540 is a wasteful number, since it uses less digits than its factorization.

398099540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14216 (or 14214 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 398099540 is about 19952.4319319726. The cubic root of 398099540 is about 735.6375543907.

The spelling of 398099540 in words is "three hundred ninety-eight million, ninety-nine thousand, five hundred forty".