3998070257 has 2 divisors, whose sum is σ = 3998070258. Its totient is φ = 3998070256.

The previous prime is 3998070247. The next prime is 3998070299. The reversal of 3998070257 is 7520708993.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3760632976 + 237437281 = 61324^2 + 15409^2 .

It is a cyclic number.

It is not a de Polignac number, because 3998070257 - 2⁸ = 3998070001 is a prime.

It is a super-5 number, since 5×3998070257⁵ (a number of 49 digits) contains 55555 as substring.

It is not a weakly prime, because it can be changed into another prime (3998070227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999035128 + 1999035129.

It is an arithmetic number, because the mean of its divisors is an integer number (1999035129).

Almost surely, 2^3998070257 is an apocalyptic number.

It is an amenable number.

3998070257 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998070257 is an equidigital number, since it uses as much as digits as its factorization.

3998070257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 50.

The square root of 3998070257 is about 63230.2954049718. The cubic root of 3998070257 is about 1587.1457379006.

The spelling of 3998070257 in words is "three billion, nine hundred ninety-eight million, seventy thousand, two hundred fifty-seven".