399990011001001 has 4 divisors (see below), whose sum is σ = 400114657314900. Its totient is φ = 399865364687104.

The previous prime is 399990011000953. The next prime is 399990011001037. The reversal of 399990011001001 is 100100110099993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 207459400709401 + 192530610291600 = 14403451^2 + 13875540^2 .

It is a cyclic number.

It is not a de Polignac number, because 399990011001001 - 2¹³ = 399990010992809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399990011041001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62323152136 + ... + 62323158553.

It is an arithmetic number, because the mean of its divisors is an integer number (100028664328725).

Almost surely, 2^{399990011001001} is an apocalyptic number.

It is an amenable number.

399990011001001 is a deficient number, since it is larger than the sum of its proper divisors (124646313899).

399990011001001 is a wasteful number, since it uses less digits than its factorization.

399990011001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124646313898.

The product of its (nonzero) digits is 19683, while the sum is 43.

The spelling of 399990011001001 in words is "three hundred ninety-nine trillion, nine hundred ninety billion, eleven million, one thousand, one".