399999945505 has 8 divisors (see below), whose sum is σ = 481784322600. Its totient is φ = 318810364416.

The previous prime is 399999945497. The next prime is 399999945511. The reversal of 399999945505 is 505549999993.

It can be written as a sum of positive squares in 4 ways, for example, as 28251222561 + 371748722944 = 168081^2 + 609712^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399999945505 - 2³ = 399999945497 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 148697520 + ... + 148700209.

It is an arithmetic number, because the mean of its divisors is an integer number (60223040325).

Almost surely, 2^399999945505 is an apocalyptic number.

It is an amenable number.

399999945505 is a deficient number, since it is larger than the sum of its proper divisors (81784377095).

399999945505 is a wasteful number, since it uses less digits than its factorization.

399999945505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297398003.

The product of its (nonzero) digits is 797161500, while the sum is 76.

The spelling of 399999945505 in words is "three hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred forty-five thousand, five hundred five".