24978139 has 2 divisors, whose sum is σ = 24978140. Its totient is φ = 24978138.

The previous prime is 24978137. The next prime is 24978167. The reversal of 24978139 is 93187942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 24978139 - 2¹ = 24978137 is a prime.

Together with 24978137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 24978095 and 24978104.

It is not a weakly prime, because it can be changed into another prime (24978133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12489069 + 12489070.

It is an arithmetic number, because the mean of its divisors is an integer number (12489070).

Almost surely, 2^24978139 is an apocalyptic number.

24978139 is a deficient number, since it is larger than the sum of its proper divisors (1).

24978139 is an equidigital number, since it uses as much as digits as its factorization.

24978139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 24978139 is about 4997.8134218876. The cubic root of 24978139 is about 292.3165196976.

The spelling of 24978139 in words is "twenty-four million, nine hundred seventy-eight thousand, one hundred thirty-nine".