4000398497 has 2 divisors, whose sum is σ = 4000398498. Its totient is φ = 4000398496.

The previous prime is 4000398473. The next prime is 4000398509. The reversal of 4000398497 is 7948930004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2592948241 + 1407450256 = 50921^2 + 37516^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000398497 - 2²⁴ = 3983621281 is a prime.

It is not a weakly prime, because it can be changed into another prime (4000398397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000199248 + 2000199249.

It is an arithmetic number, because the mean of its divisors is an integer number (2000199249).

Almost surely, 2^4000398497 is an apocalyptic number.

It is an amenable number.

4000398497 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000398497 is an equidigital number, since it uses as much as digits as its factorization.

4000398497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 4000398497 is about 63248.7035203094. The cubic root of 4000398497 is about 1587.4537647642.

The spelling of 4000398497 in words is "four billion, three hundred ninety-eight thousand, four hundred ninety-seven".