398941257 has 32 divisors (see below), whose sum is σ = 627419520. Its totient is φ = 222289920.

The previous prime is 398941253. The next prime is 398941267. The reversal of 398941257 is 752149893.

It is not a de Polignac number, because 398941257 - 2² = 398941253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398941253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113673 + ... + 117129.

It is an arithmetic number, because the mean of its divisors is an integer number (19606860).

Almost surely, 2^398941257 is an apocalyptic number.

It is an amenable number.

398941257 is a deficient number, since it is larger than the sum of its proper divisors (228478263).

398941257 is a wasteful number, since it uses less digits than its factorization.

398941257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753.

The product of its digits is 544320, while the sum is 48.

The square root of 398941257 is about 19973.5138871456. The cubic root of 398941257 is about 736.1556515722.

The spelling of 398941257 in words is "three hundred ninety-eight million, nine hundred forty-one thousand, two hundred fifty-seven".