2478709 has 2 divisors, whose sum is σ = 2478710. Its totient is φ = 2478708.

The previous prime is 2478703. The next prime is 2478713. The reversal of 2478709 is 9078742.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1747684 + 731025 = 1322^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 2478709 - 2⁵ = 2478677 is a prime.

It is a super-2 number, since 2×2478709² = 12287996613362, which contains 22 as substring.

2478709 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2478703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1239354 + 1239355.

It is an arithmetic number, because the mean of its divisors is an integer number (1239355).

2^2478709 is an apocalyptic number.

It is an amenable number.

2478709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2478709 is an equidigital number, since it uses as much as digits as its factorization.

2478709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 2478709 is about 1574.3916285347. The cubic root of 2478709 is about 135.3344974433.

The spelling of 2478709 in words is "two million, four hundred seventy-eight thousand, seven hundred nine".