2505278 has 4 divisors (see below), whose sum is σ = 3757920. Its totient is φ = 1252638.

The previous prime is 2505277. The next prime is 2505301. The reversal of 2505278 is 8725052.

It is a semiprime because it is the product of two primes.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2505278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626318 + ... + 626321.

It is an arithmetic number, because the mean of its divisors is an integer number (939480).

2^2505278 is an apocalyptic number.

2505278 is a deficient number, since it is larger than the sum of its proper divisors (1252642).

2505278 is a wasteful number, since it uses less digits than its factorization.

2505278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252641.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 2505278 is about 1582.8070002372. The cubic root of 2505278 is about 135.8163250018.

It can be divided in two parts, 250 and 5278, that multiplied together give a triangular number (1319500 = T₁₆₂₄).

The spelling of 2505278 in words is "two million, five hundred five thousand, two hundred seventy-eight".