1978255 has 8 divisors (see below), whose sum is σ = 2388672. Its totient is φ = 1572768.

The previous prime is 1978219. The next prime is 1978267. The reversal of 1978255 is 5528791.

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 1978255 - 2⁹ = 1977743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (298584).

2^1978255 is an apocalyptic number.

1978255 is a deficient number, since it is larger than the sum of its proper divisors (410417).

1978255 is a wasteful number, since it uses less digits than its factorization.

1978255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465.

The product of its digits is 25200, while the sum is 37.

The square root of 1978255 is about 1406.5045325202. The cubic root of 1978255 is about 125.5338236796.

The spelling of 1978255 in words is "one million, nine hundred seventy-eight thousand, two hundred fifty-five".