399997753 has 2 divisors, whose sum is σ = 399997754. Its totient is φ = 399997752.

The previous prime is 399997751. The next prime is 399997771. The reversal of 399997753 is 357799993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298149289 + 101848464 = 17267^2 + 10092^2 .

It is a cyclic number.

It is not a de Polignac number, because 399997753 - 2¹ = 399997751 is a prime.

Together with 399997751, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 399997691 and 399997700.

It is not a weakly prime, because it can be changed into another prime (399997751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199998876 + 199998877.

It is an arithmetic number, because the mean of its divisors is an integer number (199998877).

Almost surely, 2^399997753 is an apocalyptic number.

It is an amenable number.

399997753 is a deficient number, since it is larger than the sum of its proper divisors (1).

399997753 is an equidigital number, since it uses as much as digits as its factorization.

399997753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14467005, while the sum is 61.

The square root of 399997753 is about 19999.9438249211. The cubic root of 399997753 is about 736.8049200557.

The spelling of 399997753 in words is "three hundred ninety-nine million, nine hundred ninety-seven thousand, seven hundred fifty-three".