2505865397 has 8 divisors (see below), whose sum is σ = 2864836416. Its totient is φ = 2147141952.

The previous prime is 2505865381. The next prime is 2505865423. The reversal of 2505865397 is 7935685052.

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

It is a cyclic number.

It is not a de Polignac number, because 2505865397 - 2⁴ = 2505865381 is a prime.

It is a super-2 number, since 2×2505865397² = 12558722775763935218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505865897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39668 + ... + 81149.

It is an arithmetic number, because the mean of its divisors is an integer number (358104552).

Almost surely, 2^2505865397 is an apocalyptic number.

It is an amenable number.

2505865397 is a deficient number, since it is larger than the sum of its proper divisors (358971019).

2505865397 is a wasteful number, since it uses less digits than its factorization.

2505865397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123787.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The square root of 2505865397 is about 50058.6196074163. The cubic root of 2505865397 is about 1358.2693884293.

The spelling of 2505865397 in words is "two billion, five hundred five million, eight hundred sixty-five thousand, three hundred ninety-seven".