4239979 has 2 divisors, whose sum is σ = 4239980. Its totient is φ = 4239978.

The previous prime is 4239971. The next prime is 4239997. The reversal of 4239979 is 9799324.

Together with next prime (4239997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4239979 - 2³ = 4239971 is a prime.

It is a d-powerful number, because it can be written as 4⁴ + 2²¹ + 3¹² + 9⁶ + 9⁶ + 7⁵ + 9⁶ .

It is not a weakly prime, because it can be changed into another prime (4239971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2119989 + 2119990.

It is an arithmetic number, because the mean of its divisors is an integer number (2119990).

Almost surely, 2^4239979 is an apocalyptic number.

4239979 is a deficient number, since it is larger than the sum of its proper divisors (1).

4239979 is an equidigital number, since it uses as much as digits as its factorization.

4239979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 4239979 is about 2059.1209289403. The cubic root of 4239979 is about 161.8531794800.

The spelling of 4239979 in words is "four million, two hundred thirty-nine thousand, nine hundred seventy-nine".