399729558 has 32 divisors (see below), whose sum is σ = 840347136. Its totient is φ = 126513728.

The previous prime is 399729557. The next prime is 399729563. The reversal of 399729558 is 855927993.

It is a junction number, because it is equal to n+sod(n) for n = 399729498 and 399729507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399729557) 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 15 ways as a sum of consecutive naturals, for example, 8335 + ... + 29477.

It is an arithmetic number, because the mean of its divisors is an integer number (26260848).

Almost surely, 2^399729558 is an apocalyptic number.

399729558 is an abundant number, since it is smaller than the sum of its proper divisors (440617578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399729558 is a wasteful number, since it uses less digits than its factorization.

399729558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21308.

The product of its digits is 6123600, while the sum is 57.

The square root of 399729558 is about 19993.2378068186. The cubic root of 399729558 is about 736.6402094832.

The spelling of 399729558 in words is "three hundred ninety-nine million, seven hundred twenty-nine thousand, five hundred fifty-eight".