25721323 has 4 divisors (see below), whose sum is σ = 27234360. Its totient is φ = 24208288.

The previous prime is 25721317. The next prime is 25721329. The reversal of 25721323 is 32312752.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25721317) and next prime (25721329).

It is a cyclic number.

It is not a de Polignac number, because 25721323 - 2¹³ = 25713131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25721329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 756493 + ... + 756526.

It is an arithmetic number, because the mean of its divisors is an integer number (6808590).

Almost surely, 2^25721323 is an apocalyptic number.

25721323 is a deficient number, since it is larger than the sum of its proper divisors (1513037).

25721323 is a wasteful number, since it uses less digits than its factorization.

25721323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513036.

The product of its digits is 2520, while the sum is 25.

The square root of 25721323 is about 5071.6193666323. The cubic root of 25721323 is about 295.1873673242.

The spelling of 25721323 in words is "twenty-five million, seven hundred twenty-one thousand, three hundred twenty-three".