25440530 has 32 divisors (see below), whose sum is σ = 48708864. Its totient is φ = 9545536.

The previous prime is 25440529. The next prime is 25440533. The reversal of 25440530 is 3504452.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 25440496 and 25440505.

It is not an unprimeable number, because it can be changed into a prime (25440533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11147 + ... + 13233.

It is an arithmetic number, because the mean of its divisors is an integer number (1522152).

Almost surely, 2^25440530 is an apocalyptic number.

25440530 is a deficient number, since it is larger than the sum of its proper divisors (23268334).

25440530 is a wasteful number, since it uses less digits than its factorization.

25440530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 25440530 is about 5043.8606245613. The cubic root of 25440530 is about 294.1092734008.

Adding to 25440530 its reverse (3504452), we get a palindrome (28944982).

The spelling of 25440530 in words is "twenty-five million, four hundred forty thousand, five hundred thirty".