1979567 has 4 divisors (see below), whose sum is σ = 2043456. Its totient is φ = 1915680.

The previous prime is 1979563. The next prime is 1979573. The reversal of 1979567 is 7659791.

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

It is a cyclic number.

It is not a de Polignac number, because 1979567 - 2² = 1979563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979563) by changing a digit.

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, 31898 + ... + 31959.

It is an arithmetic number, because the mean of its divisors is an integer number (510864).

2^1979567 is an apocalyptic number.

1979567 is a deficient number, since it is larger than the sum of its proper divisors (63889).

1979567 is an equidigital number, since it uses as much as digits as its factorization.

1979567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63888.

The product of its digits is 119070, while the sum is 44.

The square root of 1979567 is about 1406.9708596840. The cubic root of 1979567 is about 125.5615693409.

The spelling of 1979567 in words is "one million, nine hundred seventy-nine thousand, five hundred sixty-seven".