399378792189701 has 4 divisors (see below), whose sum is σ = 399832116585804. Its totient is φ = 398925467793600.

The previous prime is 399378792189691. The next prime is 399378792189709. The reversal of 399378792189701 is 107981297873993.

It is a happy number.

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 76127195508100 + 323251596681601 = 8725090^2 + 17979199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399378792189701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399378792189701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399378792189709) 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, 226662196730 + ... + 226662198491.

It is an arithmetic number, because the mean of its divisors is an integer number (99958029146451).

Almost surely, 2^{399378792189701} is an apocalyptic number.

It is an amenable number.

399378792189701 is a deficient number, since it is larger than the sum of its proper divisors (453324396103).

399378792189701 is an equidigital number, since it uses as much as digits as its factorization.

399378792189701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453324396102.

The product of its (nonzero) digits is 2592487296, while the sum is 83.

The spelling of 399378792189701 in words is "three hundred ninety-nine trillion, three hundred seventy-eight billion, seven hundred ninety-two million, one hundred eighty-nine thousand, seven hundred one".