398783911 has 4 divisors (see below), whose sum is σ = 401653000. Its totient is φ = 395914824.

The previous prime is 398783789. The next prime is 398783921. The reversal of 398783911 is 119387893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119387893 = 89 ⋅1341437.

It is a cyclic number.

It is not a de Polignac number, because 398783911 - 2¹¹ = 398781863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398783921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1434336 + ... + 1434613.

It is an arithmetic number, because the mean of its divisors is an integer number (100413250).

Almost surely, 2^398783911 is an apocalyptic number.

398783911 is a deficient number, since it is larger than the sum of its proper divisors (2869089).

398783911 is a wasteful number, since it uses less digits than its factorization.

398783911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869088.

The product of its digits is 326592, while the sum is 49.

The square root of 398783911 is about 19969.5746324252. The cubic root of 398783911 is about 736.0588567210.

The spelling of 398783911 in words is "three hundred ninety-eight million, seven hundred eighty-three thousand, nine hundred eleven".