399503673 has 12 divisors (see below), whose sum is σ = 579309588. Its totient is φ = 265297920.

The previous prime is 399503659. The next prime is 399503693. The reversal of 399503673 is 376305993.

It can be written as a sum of positive squares in 2 ways, for example, as 243453609 + 156050064 = 15603^2 + 12492^2 .

It is not a de Polignac number, because 399503673 - 2⁵ = 399503641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399503693) 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 11 ways as a sum of consecutive naturals, for example, 84048 + ... + 88673.

It is an arithmetic number, because the mean of its divisors is an integer number (48275799).

Almost surely, 2^399503673 is an apocalyptic number.

It is an amenable number.

399503673 is a deficient number, since it is larger than the sum of its proper divisors (179805915).

399503673 is a wasteful number, since it uses less digits than its factorization.

399503673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172984 (or 172981 counting only the distinct ones).

The product of its (nonzero) digits is 459270, while the sum is 45.

The square root of 399503673 is about 19987.5879735400. The cubic root of 399503673 is about 736.5014262122.

The spelling of 399503673 in words is "three hundred ninety-nine million, five hundred three thousand, six hundred seventy-three".