1979945 has 8 divisors (see below), whose sum is σ = 2592000. Its totient is φ = 1439920.

The previous prime is 1979941. The next prime is 1979947. The reversal of 1979945 is 5499791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1979945 - 2² = 1979941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1979896 and 1979905.

It is not an unprimeable number, because it can be changed into a prime (1979941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17945 + ... + 18054.

It is an arithmetic number, because the mean of its divisors is an integer number (324000).

2^1979945 is an apocalyptic number.

It is an amenable number.

1979945 is a deficient number, since it is larger than the sum of its proper divisors (612055).

1979945 is a wasteful number, since it uses less digits than its factorization.

1979945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36015.

The product of its digits is 102060, while the sum is 44.

The square root of 1979945 is about 1407.1051844123. The cubic root of 1979945 is about 125.5695608617.

The spelling of 1979945 in words is "one million, nine hundred seventy-nine thousand, nine hundred forty-five".