2505921 has 8 divisors (see below), whose sum is σ = 3645024. Its totient is φ = 1518720.

The previous prime is 2505917. The next prime is 2505983. The reversal of 2505921 is 1295052.

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

It is not a de Polignac number, because 2505921 - 2² = 2505917 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2505891 and 2505900.

It is not an unprimeable number, because it can be changed into a prime (2505901) 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, 37936 + ... + 38001.

It is an arithmetic number, because the mean of its divisors is an integer number (455628).

2^2505921 is an apocalyptic number.

It is an amenable number.

2505921 is a deficient number, since it is larger than the sum of its proper divisors (1139103).

2505921 is a wasteful number, since it uses less digits than its factorization.

2505921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75951.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 2505921 is about 1583.0101073588. The cubic root of 2505921 is about 135.8279434632.

The spelling of 2505921 in words is "two million, five hundred five thousand, nine hundred twenty-one".