399048680209 has 9 divisors (see below), whose sum is σ = 423914331387. Its totient is φ = 375565121184.

The previous prime is 399048680189. The next prime is 399048680257. The reversal of 399048680209 is 902086840993.

The square root of 399048680209 is 631703.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 310678038225 + 88370641984 = 557385^2 + 297272^2 .

It is not a de Polignac number, because 399048680209 - 2⁷ = 399048680081 is a prime.

It is a super-3 number, since 3×399048680209³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399048680269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10720372 + ... + 10757530.

Almost surely, 2^399048680209 is an apocalyptic number.

399048680209 is the 631703-rd square number.

399048680209 is the 315852-nd centered octagonal number.

It is an amenable number.

399048680209 is a deficient number, since it is larger than the sum of its proper divisors (24865651178).

399048680209 is an frugal number, since it uses more digits than its factorization.

399048680209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74352 (or 37176 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 58.

The spelling of 399048680209 in words is "three hundred ninety-nine billion, forty-eight million, six hundred eighty thousand, two hundred nine".