4079989 has 2 divisors, whose sum is σ = 4079990. Its totient is φ = 4079988.

The previous prime is 4079987. The next prime is 4080001. The reversal of 4079989 is 9899704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2739025 + 1340964 = 1655^2 + 1158^2 .

It is a cyclic number.

It is not a de Polignac number, because 4079989 - 2¹ = 4079987 is a prime.

Together with 4079987, it forms a pair of twin primes.

It is a Chen prime.

4079989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4079987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039994 + 2039995.

It is an arithmetic number, because the mean of its divisors is an integer number (2039995).

Almost surely, 2^4079989 is an apocalyptic number.

It is an amenable number.

4079989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4079989 is an equidigital number, since it uses as much as digits as its factorization.

4079989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 4079989 is about 2019.8982647648. The cubic root of 4079989 is about 159.7912512056.

The spelling of 4079989 in words is "four million, seventy-nine thousand, nine hundred eighty-nine".