25487139 has 8 divisors (see below), whose sum is σ = 34208512. Its totient is φ = 16878600.

The previous prime is 25487123. The next prime is 25487141. The reversal of 25487139 is 93178452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25487139 - 2⁴ = 25487123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25487097 and 25487106.

It is not an unprimeable number, because it can be changed into a prime (25487639) 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, 27679 + ... + 28584.

It is an arithmetic number, because the mean of its divisors is an integer number (4276064).

Almost surely, 2^25487139 is an apocalyptic number.

25487139 is a deficient number, since it is larger than the sum of its proper divisors (8721373).

25487139 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 25487139 = (13428957)₁₁.

25487139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56417.

The product of its digits is 60480, while the sum is 39.

The square root of 25487139 is about 5048.4788798211. The cubic root of 25487139 is about 294.2887740661.

The spelling of 25487139 in words is "twenty-five million, four hundred eighty-seven thousand, one hundred thirty-nine".