4025309 has 4 divisors (see below), whose sum is σ = 4029504. Its totient is φ = 4021116.

The previous prime is 4025303. The next prime is 4025317. The reversal of 4025309 is 9035204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4025309 - 2⁸ = 4025053 is a prime.

It is a super-2 number, since 2×4025309² = 32406225090962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4025303) 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, 134 + ... + 2840.

It is an arithmetic number, because the mean of its divisors is an integer number (1007376).

Almost surely, 2^4025309 is an apocalyptic number.

It is an amenable number.

4025309 is a deficient number, since it is larger than the sum of its proper divisors (4195).

4025309 is a wasteful number, since it uses less digits than its factorization.

4025309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 4025309 is about 2006.3172730154. The cubic root of 4025309 is about 159.0741976658.

It can be divided in two parts, 4025 and 309, that added together give a palindrome (4334).

The spelling of 4025309 in words is "four million, twenty-five thousand, three hundred nine".