257399898 has 64 divisors (see below), whose sum is σ = 612791040. Its totient is φ = 70543872.

The previous prime is 257399869. The next prime is 257399899. The reversal of 257399898 is 898993752.

It is not an unprimeable number, because it can be changed into a prime (257399899) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 112308 + ... + 114576.

It is an arithmetic number, because the mean of its divisors is an integer number (9574860).

Almost surely, 2^257399898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257399898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306395520).

257399898 is an abundant number, since it is smaller than the sum of its proper divisors (355391142).

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

257399898 is a wasteful number, since it uses less digits than its factorization.

257399898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391.

The product of its digits is 9797760, while the sum is 60.

The square root of 257399898 is about 16043.6871697250. The cubic root of 257399898 is about 636.1157130942.

The spelling of 257399898 in words is "two hundred fifty-seven million, three hundred ninety-nine thousand, eight hundred ninety-eight".