398757888 has 156 divisors (see below), whose sum is σ = 1194739260. Its totient is φ = 127991808.

The previous prime is 398757871. The next prime is 398757893. The reversal of 398757888 is 888757893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 212926464 + 185831424 = 14592^2 + 13632^2 .

Its product of digits (27095040) is a multiple of the sum of its prime factors (432).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1068870 + ... + 1069242.

It is an arithmetic number, because the mean of its divisors is an integer number (7658585).

Almost surely, 2^398757888 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 398757888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (597369630).

398757888 is an abundant number, since it is smaller than the sum of its proper divisors (795981372).

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

398757888 is a wasteful number, since it uses less digits than its factorization.

398757888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 407 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 63.

The square root of 398757888 is about 19968.9230555882. The cubic root of 398757888 is about 736.0428456469.

The spelling of 398757888 in words is "three hundred ninety-eight million, seven hundred fifty-seven thousand, eight hundred eighty-eight".