1979775 has 48 divisors (see below), whose sum is σ = 4166400. Its totient is φ = 902880.

The previous prime is 1979773. The next prime is 1979779. The reversal of 1979775 is 5779791.

It is not a de Polignac number, because 1979775 - 2¹ = 1979773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1979775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4516 + ... + 4934.

It is an arithmetic number, because the mean of its divisors is an integer number (86800).

2^1979775 is an apocalyptic number.

1979775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1979775 is an abundant number, since it is smaller than the sum of its proper divisors (2186625).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1979775 is a wasteful number, since it uses less digits than its factorization.

1979775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 434 counting only the distinct ones).

The product of its digits is 138915, while the sum is 45.

The square root of 1979775 is about 1407.0447754070. The cubic root of 1979775 is about 125.5659669174.

The spelling of 1979775 in words is "one million, nine hundred seventy-nine thousand, seven hundred seventy-five".