2278521 has 24 divisors (see below), whose sum is σ = 3831360. Its totient is φ = 1277856.

The previous prime is 2278519. The next prime is 2278543. The reversal of 2278521 is 1258722.

It is not a de Polignac number, because 2278521 - 2¹ = 2278519 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3411 + ... + 4023.

It is an arithmetic number, because the mean of its divisors is an integer number (159640).

2^2278521 is an apocalyptic number.

2278521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2278521 is a deficient number, since it is larger than the sum of its proper divisors (1552839).

2278521 is a wasteful number, since it uses less digits than its factorization.

2278521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 682 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 2278521 is about 1509.4770617668. The cubic root of 2278521 is about 131.5884218834.

The spelling of 2278521 in words is "two million, two hundred seventy-eight thousand, five hundred twenty-one".