399198123 has 6 divisors (see below), whose sum is σ = 576619524. Its totient is φ = 266132076.

The previous prime is 399198101. The next prime is 399198203. The reversal of 399198123 is 321891993.

It is a happy number.

It is not a de Polignac number, because 399198123 - 2²¹ = 397100971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399198323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22177665 + ... + 22177682.

It is an arithmetic number, because the mean of its divisors is an integer number (96103254).

Almost surely, 2^399198123 is an apocalyptic number.

399198123 is a deficient number, since it is larger than the sum of its proper divisors (177421401).

399198123 is a wasteful number, since it uses less digits than its factorization.

399198123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44355353 (or 44355350 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 399198123 is about 19979.9430179368. The cubic root of 399198123 is about 736.3136136656.

It can be divided in two parts, 3991981 and 23, that added together give a square (3992004 = 1998²).

The spelling of 399198123 in words is "three hundred ninety-nine million, one hundred ninety-eight thousand, one hundred twenty-three".