1979905 has 8 divisors (see below), whose sum is σ = 2515752. Its totient is φ = 1490688.

The previous prime is 1979899. The next prime is 1979911. The reversal of 1979905 is 5099791.

It is an interprime number because it is at equal distance from previous prime (1979899) and next prime (1979911).

It can be written as a sum of positive squares in 4 ways, for example, as 53361 + 1926544 = 231^2 + 1388^2 .

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 1979905 - 2³ = 1979897 is a prime.

It is a Duffinian 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, 11562 + ... + 11731.

It is an arithmetic number, because the mean of its divisors is an integer number (314469).

2^1979905 is an apocalyptic number.

It is an amenable number.

1979905 is a deficient number, since it is larger than the sum of its proper divisors (535847).

1979905 is a wasteful number, since it uses less digits than its factorization.

1979905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23315.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 1979905 is about 1407.0909707620. The cubic root of 1979905 is about 125.5687152463.

The spelling of 1979905 in words is "one million, nine hundred seventy-nine thousand, nine hundred five".