399639636373 has 2 divisors, whose sum is σ = 399639636374. Its totient is φ = 399639636372.

The previous prime is 399639636367. The next prime is 399639636379. The reversal of 399639636373 is 373636936993.

It is a balanced prime because it is at equal distance from previous prime (399639636367) and next prime (399639636379).

It can be written as a sum of positive squares in only one way, i.e., 391653175684 + 7986460689 = 625822^2 + 89367^2 .

It is a cyclic number.

It is not a de Polignac number, because 399639636373 - 2¹³ = 399639628181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399639636299 and 399639636308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399639636379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199819818186 + 199819818187.

It is an arithmetic number, because the mean of its divisors is an integer number (199819818187).

Almost surely, 2^399639636373 is an apocalyptic number.

It is an amenable number.

399639636373 is a deficient number, since it is larger than the sum of its proper divisors (1).

399639636373 is an equidigital number, since it uses as much as digits as its factorization.

399639636373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 267846264, while the sum is 67.

The spelling of 399639636373 in words is "three hundred ninety-nine billion, six hundred thirty-nine million, six hundred thirty-six thousand, three hundred seventy-three".