278227979 has 4 divisors (see below), whose sum is σ = 278468376. Its totient is φ = 277987584.

The previous prime is 278227969. The next prime is 278227997. The reversal of 278227979 is 979722872.

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

It is a cyclic number.

It is not a de Polignac number, because 278227979 - 2²⁰ = 277179403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 278227979.

It is not an unprimeable number, because it can be changed into a prime (278227909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118454 + ... + 120779.

It is an arithmetic number, because the mean of its divisors is an integer number (69617094).

Almost surely, 2^278227979 is an apocalyptic number.

278227979 is a deficient number, since it is larger than the sum of its proper divisors (240397).

278227979 is a wasteful number, since it uses less digits than its factorization.

278227979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240396.

The product of its digits is 1778112, while the sum is 53.

The square root of 278227979 is about 16680.1672353727. The cubic root of 278227979 is about 652.8302455727.

The spelling of 278227979 in words is "two hundred seventy-eight million, two hundred twenty-seven thousand, nine hundred seventy-nine".