25709429 has 2 divisors, whose sum is σ = 25709430. Its totient is φ = 25709428.

The previous prime is 25709401. The next prime is 25709443. The reversal of 25709429 is 92490752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21996100 + 3713329 = 4690^2 + 1927^2 .

It is a cyclic number.

It is not a de Polignac number, because 25709429 - 2¹² = 25705333 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25709392 and 25709401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25709479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12854714 + 12854715.

It is an arithmetic number, because the mean of its divisors is an integer number (12854715).

Almost surely, 2^25709429 is an apocalyptic number.

It is an amenable number.

25709429 is a deficient number, since it is larger than the sum of its proper divisors (1).

25709429 is an equidigital number, since it uses as much as digits as its factorization.

25709429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 25709429 is about 5070.4466272706. The cubic root of 25709429 is about 295.1418603355.

The spelling of 25709429 in words is "twenty-five million, seven hundred nine thousand, four hundred twenty-nine".