399959953 has 2 divisors, whose sum is σ = 399959954. Its totient is φ = 399959952.

The previous prime is 399959929. The next prime is 399959983. The reversal of 399959953 is 359959993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338854464 + 61105489 = 18408^2 + 7817^2 .

It is an emirp because it is prime and its reverse (359959993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399959953 - 2²⁵ = 366405521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399959891 and 399959900.

It is not a weakly prime, because it can be changed into another prime (399959983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199979976 + 199979977.

It is an arithmetic number, because the mean of its divisors is an integer number (199979977).

Almost surely, 2^399959953 is an apocalyptic number.

It is an amenable number.

399959953 is a deficient number, since it is larger than the sum of its proper divisors (1).

399959953 is an equidigital number, since it uses as much as digits as its factorization.

399959953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13286025, while the sum is 61.

The square root of 399959953 is about 19998.9987999400. The cubic root of 399959953 is about 736.7817098392.

The spelling of 399959953 in words is "three hundred ninety-nine million, nine hundred fifty-nine thousand, nine hundred fifty-three".