25515434 has 16 divisors (see below), whose sum is σ = 44152128. Its totient is φ = 10832352.

The previous prime is 25515421. The next prime is 25515439. The reversal of 25515434 is 43451552.

It is a junction number, because it is equal to n+sod(n) for n = 25515397 and 25515406.

It is not an unprimeable number, because it can be changed into a prime (25515439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7019 + ... + 10014.

It is an arithmetic number, because the mean of its divisors is an integer number (2759508).

Almost surely, 2^25515434 is an apocalyptic number.

25515434 is a deficient number, since it is larger than the sum of its proper divisors (18636694).

25515434 is a wasteful number, since it uses less digits than its factorization.

25515434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17149.

The product of its digits is 12000, while the sum is 29.

The square root of 25515434 is about 5051.2804317321. The cubic root of 25515434 is about 294.3976370936.

Adding to 25515434 its reverse (43451552), we get a palindrome (68966986).

The spelling of 25515434 in words is "twenty-five million, five hundred fifteen thousand, four hundred thirty-four".