25721433 has 6 divisors (see below), whose sum is σ = 37153194. Its totient is φ = 17147616.

The previous prime is 25721431. The next prime is 25721441. The reversal of 25721433 is 33412752.

It can be written as a sum of positive squares in only one way, i.e., 18688329 + 7033104 = 4323^2 + 2652^2 .

It is not a de Polignac number, because 25721433 - 2¹ = 25721431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25721397 and 25721406.

It is not an unprimeable number, because it can be changed into a prime (25721431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1428960 + ... + 1428977.

It is an arithmetic number, because the mean of its divisors is an integer number (6192199).

Almost surely, 2^25721433 is an apocalyptic number.

It is an amenable number.

25721433 is a deficient number, since it is larger than the sum of its proper divisors (11431761).

25721433 is a wasteful number, since it uses less digits than its factorization.

25721433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857943 (or 2857940 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 25721433 is about 5071.6302112832. The cubic root of 25721433 is about 295.1877881237.

It can be divided in two parts, 2572 and 1433, that added together give a triangular number (4005 = T₈₉).

The spelling of 25721433 in words is "twenty-five million, seven hundred twenty-one thousand, four hundred thirty-three".