389951609 has 2 divisors, whose sum is σ = 389951610. Its totient is φ = 389951608.

The previous prime is 389951567. The next prime is 389951629. The reversal of 389951609 is 906159983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314956009 + 74995600 = 17747^2 + 8660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389951609 is a prime.

It is not a weakly prime, because it can be changed into another prime (389951629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194975804 + 194975805.

It is an arithmetic number, because the mean of its divisors is an integer number (194975805).

Almost surely, 2^389951609 is an apocalyptic number.

It is an amenable number.

389951609 is a deficient number, since it is larger than the sum of its proper divisors (1).

389951609 is an equidigital number, since it uses as much as digits as its factorization.

389951609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 389951609 is about 19747.1924333562. The cubic root of 389951609 is about 730.5841380714.

It can be divided in two parts, 38995 and 1609, that added together give a palindrome (40604).

The spelling of 389951609 in words is "three hundred eighty-nine million, nine hundred fifty-one thousand, six hundred nine".