2278639 has 8 divisors (see below), whose sum is σ = 2528640. Its totient is φ = 2035800.

The previous prime is 2278637. The next prime is 2278643. The reversal of 2278639 is 9368722.

2278639 = 54³ + 55³ + ... + 64³.

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

It is a cyclic number.

It is not a de Polignac number, because 2278639 - 2¹ = 2278637 is a prime.

It is a Duffinian number.

2278639 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2278598 and 2278607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278631) 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, 1107 + ... + 2404.

It is an arithmetic number, because the mean of its divisors is an integer number (316080).

2^2278639 is an apocalyptic number.

2278639 is a deficient number, since it is larger than the sum of its proper divisors (250001).

2278639 is a wasteful number, since it uses less digits than its factorization.

2278639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581.

The product of its digits is 36288, while the sum is 37.

The square root of 2278639 is about 1509.5161476447. The cubic root of 2278639 is about 131.5906934103.

The spelling of 2278639 in words is "two million, two hundred seventy-eight thousand, six hundred thirty-nine".