389408557 has 2 divisors, whose sum is σ = 389408558. Its totient is φ = 389408556.

The previous prime is 389408533. The next prime is 389408563. The reversal of 389408557 is 755804983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223024356 + 166384201 = 14934^2 + 12899^2 .

It is an emirp because it is prime and its reverse (755804983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389408557 - 2¹¹ = 389406509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 389408557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389408587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194704278 + 194704279.

It is an arithmetic number, because the mean of its divisors is an integer number (194704279).

Almost surely, 2^389408557 is an apocalyptic number.

It is an amenable number.

389408557 is a deficient number, since it is larger than the sum of its proper divisors (1).

389408557 is an equidigital number, since it uses as much as digits as its factorization.

389408557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The square root of 389408557 is about 19733.4375363240. The cubic root of 389408557 is about 730.2448399964.

The spelling of 389408557 in words is "three hundred eighty-nine million, four hundred eight thousand, five hundred fifty-seven".