1979591 has 8 divisors (see below), whose sum is σ = 2133120. Its totient is φ = 1831032.

The previous prime is 1979581. The next prime is 1979609. The reversal of 1979591 is 1959791.

It is a happy number.

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 1979591 - 2¹⁰ = 1978567 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 (1979581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 2028.

It is an arithmetic number, because the mean of its divisors is an integer number (266640).

2^1979591 is an apocalyptic number.

1979591 is a deficient number, since it is larger than the sum of its proper divisors (153529).

1979591 is a wasteful number, since it uses less digits than its factorization.

1979591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485.

The product of its digits is 25515, while the sum is 41.

The square root of 1979591 is about 1406.9793886195. The cubic root of 1979591 is about 125.5620767693.

The spelling of 1979591 in words is "one million, nine hundred seventy-nine thousand, five hundred ninety-one".