398108785 has 8 divisors (see below), whose sum is σ = 484275240. Its totient is φ = 314123904.

The previous prime is 398108783. The next prime is 398108791. The reversal of 398108785 is 587801893.

It can be written as a sum of positive squares in 4 ways, for example, as 105596176 + 292512609 = 10276^2 + 17103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398108785 - 2¹ = 398108783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398108783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544990 + ... + 545719.

It is an arithmetic number, because the mean of its divisors is an integer number (60534405).

Almost surely, 2^398108785 is an apocalyptic number.

It is an amenable number.

398108785 is a deficient number, since it is larger than the sum of its proper divisors (86166455).

398108785 is a wasteful number, since it uses less digits than its factorization.

398108785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090787.

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 398108785 is about 19952.6636066466. The cubic root of 398108785 is about 735.6432488765.

It can be divided in two parts, 398108 and 785, that added together give a palindrome (398893).

The spelling of 398108785 in words is "three hundred ninety-eight million, one hundred eight thousand, seven hundred eighty-five".