4000025 has 6 divisors (see below), whose sum is σ = 4960062. Its totient is φ = 3200000.

The previous prime is 3999971. The next prime is 4000037. The reversal of 4000025 is 5200004.

It can be written as a sum of positive squares in 3 ways, for example, as 1430416 + 2569609 = 1196^2 + 1603^2 .

It is a sliding number, since 4000025 = 25 + 4000000 and 1/25 + 1/4000000 = 0.04000025.

It is not a de Polignac number, because 4000025 - 2¹⁰ = 3999001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79976 + ... + 80025.

It is an arithmetic number, because the mean of its divisors is an integer number (826677).

Almost surely, 2^4000025 is an apocalyptic number.

It is an amenable number.

4000025 is a deficient number, since it is larger than the sum of its proper divisors (960037).

4000025 is a wasteful number, since it uses less digits than its factorization.

4000025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160011 (or 160006 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 4000025 is about 2000.0062499902. The cubic root of 4000025 is about 158.7404359047.

Adding to 4000025 its reverse (5200004), we get a palindrome (9200029).

It can be divided in two parts, 40000 and 25, that multiplied together give a 6-th power (1000000 = 10⁶).

The spelling of 4000025 in words is "four million, twenty-five", and thus it is an aban number.