398288393 has 16 divisors (see below), whose sum is σ = 445098240. Its totient is φ = 354182400.

The previous prime is 398288389. The next prime is 398288399. The reversal of 398288393 is 393882893.

It is a cyclic number.

It is not a de Polignac number, because 398288393 - 2² = 398288389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398288399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137783 + ... + 140643.

It is an arithmetic number, because the mean of its divisors is an integer number (27818640).

Almost surely, 2^398288393 is an apocalyptic number.

It is an amenable number.

398288393 is a deficient number, since it is larger than the sum of its proper divisors (46809847).

398288393 is a wasteful number, since it uses less digits than its factorization.

398288393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328.

The product of its digits is 2239488, while the sum is 53.

The square root of 398288393 is about 19957.1639518244. The cubic root of 398288393 is about 735.7538614802.

The spelling of 398288393 in words is "three hundred ninety-eight million, two hundred eighty-eight thousand, three hundred ninety-three".