1231979 has 16 divisors (see below), whose sum is σ = 1516800. Its totient is φ = 977184.

The previous prime is 1231961. The next prime is 1231981. The reversal of 1231979 is 9791321.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231979 is a prime.

It is a Duffinian number.

1231979 is an undulating number in base 12.

It is not an unprimeable number, because it can be changed into a prime (1231999) 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 15 ways as a sum of consecutive naturals, for example, 7769 + ... + 7925.

It is an arithmetic number, because the mean of its divisors is an integer number (94800).

2^1231979 is an apocalyptic number.

1231979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1231979 is a deficient number, since it is larger than the sum of its proper divisors (284821).

1231979 is a wasteful number, since it uses less digits than its factorization.

1231979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242.

The product of its digits is 3402, while the sum is 32.

The square root of 1231979 is about 1109.9454941573. The cubic root of 1231979 is about 107.2015591126.

The spelling of 1231979 in words is "one million, two hundred thirty-one thousand, nine hundred seventy-nine".