2640025 has 6 divisors (see below), whose sum is σ = 3273662. Its totient is φ = 2112000.

The previous prime is 2640023. The next prime is 2640041. The reversal of 2640025 is 5200462.

It can be written as a sum of positive squares in 3 ways, for example, as 760384 + 1879641 = 872^2 + 1371^2 .

It is not a de Polignac number, because 2640025 - 2¹ = 2640023 is a prime.

It is a Duffinian number.

2640025 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2639984 and 2640011.

It is not an unprimeable number, because it can be changed into a prime (2640023) 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, 52776 + ... + 52825.

2^2640025 is an apocalyptic number.

2640025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2640025 is a deficient number, since it is larger than the sum of its proper divisors (633637).

2640025 is a wasteful number, since it uses less digits than its factorization.

2640025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105611 (or 105606 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2640025 is about 1624.8153741272. The cubic root of 2640025 is about 138.2089008629.

Adding to 2640025 its reverse (5200462), we get a palindrome (7840487).

The spelling of 2640025 in words is "two million, six hundred forty thousand, twenty-five".