2505890 has 16 divisors (see below), whose sum is σ = 4666680. Its totient is φ = 967680.

The previous prime is 2505863. The next prime is 2505901. The reversal of 2505890 is 985052.

It is a Cunningham number, because it is equal to 1583²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1315609 + 1190281 = 1147^2 + 1091^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4031 + ... + 4610.

2^2505890 is an apocalyptic number.

2505890 is a deficient number, since it is larger than the sum of its proper divisors (2160790).

2505890 is a wasteful number, since it uses less digits than its factorization.

2505890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8677.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 2505890 is about 1583.0003158559. Note that the first 3 decimals coincide. The cubic root of 2505890 is about 135.8273833652.

The spelling of 2505890 in words is "two million, five hundred five thousand, eight hundred ninety".