2509278 has 16 divisors (see below), whose sum is σ = 5064336. Its totient is φ = 828800.

The previous prime is 2509271. The next prime is 2509279. The reversal of 2509278 is 8729052.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2509271) 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, 1173 + ... + 2528.

It is an arithmetic number, because the mean of its divisors is an integer number (316521).

2^2509278 is an apocalyptic number.

2509278 is an abundant number, since it is smaller than the sum of its proper divisors (2555058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2509278 is a wasteful number, since it uses less digits than its factorization.

2509278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 2509278 is about 1584.0700742076. The cubic root of 2509278 is about 135.8885693363. Note that the first 3 decimals are identical.

The spelling of 2509278 in words is "two million, five hundred nine thousand, two hundred seventy-eight".