398493399081 has 4 divisors (see below), whose sum is σ = 531324532112. Its totient is φ = 265662266052.

The previous prime is 398493399047. The next prime is 398493399089. The reversal of 398493399081 is 180993394893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-398493399081 is a prime.

It is a super-2 number, since 2×398493399081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398493399089) 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 3 ways as a sum of consecutive naturals, for example, 66415566511 + ... + 66415566516.

It is an arithmetic number, because the mean of its divisors is an integer number (132831133028).

Almost surely, 2^398493399081 is an apocalyptic number.

It is an amenable number.

398493399081 is a deficient number, since it is larger than the sum of its proper divisors (132831133031).

398493399081 is a wasteful number, since it uses less digits than its factorization.

398493399081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132831133030.

The product of its (nonzero) digits is 45349632, while the sum is 66.

The spelling of 398493399081 in words is "three hundred ninety-eight billion, four hundred ninety-three million, three hundred ninety-nine thousand, eighty-one".