1979455 has 4 divisors (see below), whose sum is σ = 2375352. Its totient is φ = 1583560.

The previous prime is 1979441. The next prime is 1979473. The reversal of 1979455 is 5549791.

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

It is not a de Polignac number, because 1979455 - 2¹¹ = 1977407 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197941 + ... + 197950.

It is an arithmetic number, because the mean of its divisors is an integer number (593838).

2^1979455 is an apocalyptic number.

1979455 is a deficient number, since it is larger than the sum of its proper divisors (395897).

1979455 is an equidigital number, since it uses as much as digits as its factorization.

1979455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395896.

The product of its digits is 56700, while the sum is 40.

The square root of 1979455 is about 1406.9310573017. The cubic root of 1979455 is about 125.5592012876.

The spelling of 1979455 in words is "one million, nine hundred seventy-nine thousand, four hundred fifty-five".