1672779989 has 2 divisors, whose sum is σ = 1672779990. Its totient is φ = 1672779988.

The previous prime is 1672779971. The next prime is 1672780013. The reversal of 1672779989 is 9899772761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002228964 + 670551025 = 31658^2 + 25895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1672779989 - 2¹² = 1672775893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1672779919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836389994 + 836389995.

It is an arithmetic number, because the mean of its divisors is an integer number (836389995).

Almost surely, 2^1672779989 is an apocalyptic number.

It is an amenable number.

1672779989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1672779989 is an equidigital number, since it uses as much as digits as its factorization.

1672779989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24004512, while the sum is 65.

The square root of 1672779989 is about 40899.6331157139. The cubic root of 1672779989 is about 1187.0789617081.

The spelling of 1672779989 in words is "one billion, six hundred seventy-two million, seven hundred seventy-nine thousand, nine hundred eighty-nine".